{"title":"Trilogy","description":"\u003cp\u003eTrilogy Audio Systems has been designed by one person since 1990. Nic Poulson trained with the BBC in broadcast engineering in the eighties, founded Trilogy in 1990, and remains the principal designer of every product the company makes. The corporation's standards left a mark: the way to achieve true quality is to strive for excellence in every area and accept nothing less. Trilogy is one of the very few British owned, British built manufacturers of fine audio, and the work is done back to first principles — identifying the fundamental questions at the core of each design issue, then optimising each electrical element rather than improving on what already exists.\u003c\/p\u003e\n\u003cp\u003eThe engineering runs along a few consistent lines. The 6H6П valve is used throughout the range for its extremely linear gain, high transconductance and high current properties, and in several products it operates in a grounded grid configuration that lets the tube produce even lower levels of distortion. Choke input power supplies are unusual today, largely for reasons of cost and space. Trilogy specifies them anyway: a large choke placed between the rectifier and the smoothing capacitor bank makes the current draw from the mains transformer almost a continuous sine wave, instead of a series of current spikes at twice the mains frequency. The stress in the power supply components and the noise produced fall away with it.\u003c\/p\u003e\n\u003cp\u003eEvery Trilogy power amplifier uses a compound output stage. A small linear MOSFET controls the loudspeaker, and a bank of bipolar transistors augments it with the current a demanding load requires. The result is delicacy unattainable with a MOSFET-only output stage together with enough output current to genuinely control the speaker. Where balanced operation earns its complexity it is used — the 925 and 995R are bridge amplifiers and make full use of it; the 993 and 994 are not bridge designs and so are not given a differential feed for its own sake.\u003c\/p\u003e\n\u003cp\u003eThe casework is part of the engineering. Machined panels, lids and side panels add mass and damp vibration. Heatsink fins vary in depth, width and spacing to reduce the main resonance to a minimum, and the high mass holds the output devices at close to constant temperature. K Material, an expensive and non-resonant material, is used for the feet on all larger products. Binding posts are pure copper Mundorf. The 906i is hand made exclusively in England; the 931i is assembled entirely by hand in Trilogy's UK workshops.\u003c\/p\u003e\n\u003cp\u003eThe control layer is Trilogy's own. TASlink is a proprietary link between Trilogy components that synchronises switching and carries information such as amplifier temperature and real-time current delivery to a large red dot matrix display, adjustable across nine brightness levels or set to track the ambient light. The firmware is driven by a rotary encoder with enter and escape buttons, covering volume and balance alongside timing functions, per-input naming, source level trimming and more. The Personal Remote Control is machined from billet with ball bearing buttons.\u003c\/p\u003e\n\u003cp\u003eThe Trilogy range — integrated amplifiers, preamplifiers, stereo and mono power amplifiers, phono stages and headphone amplifiers — is available through Alma East and Alma West.\u003c\/p\u003e","products":[{"product_id":"trilogy-921-integrated-amplifier","title":"Trilogy 921 Integrated Amplifier","description":"\u003cp\u003eThe 921 is Trilogy's solid-state integrated amplifier, launched in 2023 and described by the company as its \"entry level\" model. Rather than build a preamplifier and a separate power amplifier into one chassis, Trilogy chose a single, ultra linear gain stage that does all the voltage gain necessary, connected directly to a compound output stage reminiscent of the larger Trilogy power amplifiers and using the same Japanese bipolar devices.\u003c\/p\u003e\u003cp\u003eThe topology has extremely high bandwidth, low distortion and very good loudspeaker control with only a tiny amount of overall shunt feedback. Rectification and the smoothing capacitor bank sit on each of the left and right amplifier modules, and a separate winding on the mains transformer feeds them independently. To keep signal and current paths short and minimise interaction between them, the layout is stacked: the voltage gain cell sits above the main circuit board that carries the output stage and power supply.\u003c\/p\u003e\u003cp\u003eRated output is 75 watts per channel into a recommended load of 3 to 16 ohms, from five pairs of RCA inputs. Frequency response runs 5 Hz to 100 kHz within half a decibel. The 921 is phase inverting — worth noting when setting up a system, since absolute phase can be corrected at the loudspeaker connections. \u003cem\u003eThe Ear\u003c\/em\u003e made it an Editor's Choice in January 2024.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated power:\u003c\/strong\u003e 75 watts per channel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended load impedance:\u003c\/strong\u003e 3–16 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e solid state; single ultra linear gain stage into compound output stage; tiny amount of overall shunt feedback\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 5 pairs RCA phono sockets; input impedance 50 kohms; sensitivity 500 mV\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 5 Hz – 100 kHz +\/- 0.5 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistortion:\u003c\/strong\u003e less than 1% A weighted at rated output into 8 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e inverting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower consumption:\u003c\/strong\u003e 1 W standby \/ 300 W maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e 465 x 312 x 106 mm (465 x 350 x 106 mm including connectors) \/ 11 kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Natural","offer_id":49211047870683,"sku":null,"price":8500.0,"currency_code":"USD","in_stock":true},{"title":"Black","offer_id":49211047903451,"sku":null,"price":8500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/Trilogy_2BAudio_2BApril_2B2023-1-EAR-AP_HF_2B_N.jpg?v=1788279882"},{"product_id":"trilogy-925-integrated-amplifier","title":"Trilogy 925 Integrated Amplifier","description":"\u003cp\u003eThe 925 is Trilogy's hybrid integrated amplifier, in the range since 2014. The balanced input stage uses the 6H6П super tube to provide pure triode Class A, zero feedback voltage gain of exceptional linearity. The output stage uses Trilogy's zero feedback MOSFET and bipolar topology in a bridge configuration for 135 watts per channel into 8 ohms.\u003c\/p\u003e\u003cp\u003eThe amplifier is fully symmetrical inside and out. Unlike many amplifiers described as balanced, the signal positive and negative are never tied to ground in the 925. Inputs run to three XLR and three RCA plus a 3.5 mm stereo jack, managed by a fully customisable input management system that also communicates with other Trilogy components over TASlink. The control menu is reached through the rotary encoder with enter and escape buttons, with the hierarchy arranged to keep commonly used commands close to hand. The machined billet heatsinks dissipate heat and provide vibration damping.\u003c\/p\u003e\u003cp\u003eStandard finish is a soft, finely bead blasted natural aluminium. Trilogy's lustrous paint finishes are available at extra cost, as is the Chameleon Colour System for custom finishes. Frequency response runs 10 Hz to 50 kHz within half a decibel, and the amplifier is phase correct.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated power:\u003c\/strong\u003e 135 watts per channel into 8 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e hybrid; 6H6П balanced input stage, pure triode Class A, zero feedback; zero feedback MOSFET and bipolar output stage in bridge configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs (single ended):\u003c\/strong\u003e 3 RCA phono sockets, 1 on 3.5 mm stereo jack; greater than 42 kohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs (balanced):\u003c\/strong\u003e 3 XLR 3-pin female; greater than 84 kohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput sensitivity:\u003c\/strong\u003e 600 mV RMS for rated output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSend (tape) outputs:\u003c\/strong\u003e 1 RCA phono sockets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 10 Hz – 50 kHz +\/- 0.5 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistortion:\u003c\/strong\u003e less than 1% A weighted at rated output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e phase correct (non inverting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinishes:\u003c\/strong\u003e bead blasted natural aluminium standard; lustrous paint and Chameleon Colour System at extra cost\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e 445 x 430 x 127 mm (445 x 485 x 138 mm including connectors) \/ 25.5 kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Default Title","offer_id":49211048558811,"sku":null,"price":20000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/925-Positional-main-image.jpg?v=1788279922"},{"product_id":"trilogy-903-preamplifier","title":"Trilogy 903 Preamplifier","description":"\u003cp\u003eThe 903 is Trilogy's single-ended valve preamplifier, in the range since 2016, and the partner to the 993 power amplifier. The gain stage uses the 6H6П super tube for all voltage gain. This Russian military triode has high transconductance and low mu for performance at audio frequencies, and the grounded grid configuration allows it to operate in pure Class A with the highest linearity and lowest distortion. Output impedance is low for drive capability.\u003c\/p\u003e\u003cp\u003eThree transformers feed the power supplies. The valve's high voltage supply is actively shunt regulated, so the regulator can sink as well as source current — the detail that keeps the voltage rail quiet and stable under all conditions. Six pairs of RCA inputs feed two pairs of RCA main outputs plus a tape send. Control is through the rotary encoder with enter and escape buttons: display brightness, custom input labels, per-input gain trims, film mode, security bonding, sleep countdown, timed system switch-on over TASlink and remote operation.\u003c\/p\u003e\u003cp\u003eThe optional integral phono stage is not an afterthought. It has much in common with the 907, being a Class A design with passive RIAA equalisation and a fully discrete active circuit, and its on-board shunt regulators have their own power supply. Gain for moving magnet or moving coil, and cartridge resistance and capacitance loading, are all adjustable from the menu hierarchy — locally, by infrared handset, or over TASlink.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e 6H6П super tube, grounded grid, pure Class A voltage gain\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhono stage:\u003c\/strong\u003e optional integral MM\/MC; Class A, passive RIAA EQ, fully discrete; gain and loading adjustable from the menu\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 6 pairs RCA phono sockets; 50 kohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e 2 pairs RCA main (under 200 ohms); 1 pair RCA send (tape)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e 14 dB +\/- 0.5 dB inputs to main; 0 dB inputs to send; film mode 0 dB +\/- 1 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 2 Hz – 50 kHz +\/- 0.5 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistortion:\u003c\/strong\u003e less than 0.05% A weighted at 1 V output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e phase correct (non inverting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower consumption:\u003c\/strong\u003e 40 W maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e 465 x 312 x 106 mm (465 x 350 x 106 mm including connectors) \/ 10 kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Line","offer_id":49211048919259,"sku":null,"price":12000.0,"currency_code":"USD","in_stock":true},{"title":"Line + Phono","offer_id":49211048952027,"sku":null,"price":15000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/903.jpg?v=1788279943"},{"product_id":"trilogy-914-preamplifier","title":"Trilogy 914 Preamplifier","description":"\u003cp\u003eThe 914 is a fully balanced valve preamplifier, balanced from input to output. Six inputs are provided — three balanced XLR and three RCA — with one balanced and one RCA output per channel plus a tape send. Signal switching is handled by no fewer than 28 sputtered ruthenium Pickering relays.\u003c\/p\u003e\u003cp\u003eSix 6H6П super tubes handle all gain duties. Three separate transformers serve the ancillary control electronics, the valve heaters and the high tension supplies, so the three do not interact. The 914 carries four shunt regulated power supplies: because a shunt regulator can sink as well as source current as the audio circuit demands, the voltage rail stays silent.\u003c\/p\u003e\u003cp\u003eThe firmware rewards exploration. The control menu is reached through the rotary encoder with enter and escape buttons, with the hierarchy arranged to keep commonly used commands close to hand. Display brightness, custom input labels, per-input gain trims, film mode, security bonding, sleep countdown, timed system switch-on over TASlink and remote operation are among the configurable options. Gain to the main outputs is 24 dB, frequency response runs 10 Hz to 150 kHz within half a decibel, and the preamplifier is phase correct. Trilogy pairs the 914 with the 994 mono power amplifiers, and \u003cem\u003ehi-fi+\u003c\/em\u003e reviewed the two together in May 2025.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e fully balanced input to output; six 6H6П super tubes; four shunt regulated power supplies; three separate transformers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal switching:\u003c\/strong\u003e 28 sputtered ruthenium Pickering relays\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 3 pairs XLR 3-pin female (over 48 kohms); 3 pairs RCA phono sockets (over 24 kohms)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e 1 pair XLR 3-pin male; 1 pair RCA; 1 pair RCA send (tape); 400 R output impedance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e 24 dB inputs to main output; 0 dB inputs to send\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 10 Hz – 150 kHz +\/- 0.5 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e phase correct (non inverting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower consumption:\u003c\/strong\u003e 55 W maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e 465 x 370 x 115 mm \/ 12.4 kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Default Title","offer_id":49211048984795,"sku":null,"price":18000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/Trilogy_Audio_April_2023-2.jpg?v=1788279959"},{"product_id":"trilogy-915r-preamplifier","title":"Trilogy 915R Preamplifier","description":"\u003cp\u003eThe 915R is Trilogy's statement preamplifier, in the range since 2018. Four 6H6П super tubes mounted on solid billets provide the voltage gain. A series of three transformers feeds the power supply, and the valves' high voltage supply is actively shunt regulated — the rail can both sink and source current, which keeps it stable and quiet. Output is by Lundahl transformers, and there are no signal coupling capacitors anywhere in the circuit.\u003c\/p\u003e\u003cp\u003eConnectivity is comprehensive. Six inputs (three RCA, three XLR) feed four outputs (two RCA, two XLR) plus one RCA record send; one of the single-ended inputs can also be used as a return channel. TASlink RJ45 sockets sit at the far right of the rear panel. The casework is machined from billet alloy, and the preamplifier is supplied as standard with the machined billet Personal Remote Control and a power cord.\u003c\/p\u003e\u003cp\u003eThe menu goes further than most. Beyond display brightness, custom input labels, per-input gain trims, film mode, security bonding, sleep countdown and timed system switch-on over TASlink, the 915R will show the valves' work hours, schedule on and off times for everything connected over TASlink, report the temperature of any connected Trilogy amplifier, and display a real-time bar graph of the current being supplied to the loudspeaker. An optional security PIN entered at start-up will render the unit unusable in the event of theft.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e four 6H6П super tubes on solid billets; actively shunt regulated valve HT supply; three transformers; Lundahl output transformers; no signal coupling capacitors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 3 XLR 3-pin female (over 48 kohms); 3 pairs RCA phono sockets (over 24 kohms)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e 2 pairs XLR 3-pin male; 2 pairs RCA; 1 pair RCA send (tape); 600 ohms output impedance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e 14 dB inputs to main outputs; 0 dB inputs to send\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 20 Hz – 45 kHz +\/- 0.5 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e phase correct (non inverting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupplied with:\u003c\/strong\u003e machined billet Personal Remote Control; power cord\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower consumption:\u003c\/strong\u003e 95 W maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e 465 x 450 x 117 mm \/ 19 kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Default Title","offer_id":49211049345243,"sku":null,"price":30000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/Trilogy_Audio_April_2023-3.jpg?v=1788279983"},{"product_id":"trilogy-993-stereo-power-amplifier","title":"Trilogy 993 Stereo Power Amplifier","description":"\u003cp\u003eThe 993 is Trilogy's hybrid stereo power amplifier, in the range since 2016 and designed to complement the 903 preamplifier. All of its voltage gain comes from a 6H6П super tube, a Russian military triode chosen for its high transconductance and low mu. The valve operates in Class A in a grounded grid configuration with zero negative feedback. Because of the output stage's topology the valve sees only a small MOSFET as its load, which lets it deliver the flow and micro detail valves are good at.\u003c\/p\u003e\u003cp\u003eThe 993 takes the unusual step of specifying a choke input power supply for the output stage. The choke is nearly as large as the power transformer. The high current spikes conventional supplies pull from the mains are avoided; the choke allows a much more linear current draw, keeping dynamic noise under drive much lower. Premium reservoir capacitors and soft recovery diodes complete it.\u003c\/p\u003e\u003cp\u003eThe first watt an amplifier delivers is where most tonal and spatial cues sit at normal listening levels, so the output stage uses a small, agile FET to serve that region. When current demand rises, higher power bipolar devices supply the additional current, up to 125 watts into 8 ohms. There is zero global negative feedback, but high bias keeps output impedance low. TASlink adds remote switch-on, status monitoring and security bonding.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated power:\u003c\/strong\u003e 125 watts per channel into 8 ohms; 200 watts per channel into 4 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended load impedance:\u003c\/strong\u003e 4–16 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e hybrid; 6H6П grounded grid Class A voltage gain; small FET plus higher power bipolar output stage; zero global negative feedback\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower supply:\u003c\/strong\u003e choke input for the output stage; premium reservoir capacitors, soft recovery diodes; discrete shunt regulated driver supplies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 1 pair RCA phono sockets; 400 kohms; 2.0 V RMS for rated output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 5 Hz – 30 kHz +\/- 0.5 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistortion:\u003c\/strong\u003e less than 1% A weighted at rated output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e phase correct (non inverting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower consumption:\u003c\/strong\u003e under 1 W standby \/ 50 W idle \/ 700 W maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e 465 x 346 x 106 mm (465 x 378 x 106 mm including connectors) \/ 19 kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Default Title","offer_id":49211049705691,"sku":null,"price":13000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/993_front_mr.jpg?v=1788280002"},{"product_id":"trilogy-994-mono-power-amplifier","title":"Trilogy 994 Mono Power Amplifier","description":"\u003cp\u003ePriced per pair. The 994 is a mono amplifier and is sold as a matched pair of monoblocks.\u003c\/p\u003e\u003cp\u003eThe 994 is a zero negative feedback hybrid mono power amplifier. Trilogy describes it as embodying much of what the 995R does in a smaller and equally distinct sculpted form. It offers 140 watts into 8 ohms in Class AB and significantly more into lower impedances — 200 watts into 4 ohms. A 6H6П valve in a grounded grid configuration drives Trilogy's compound output stage, and a massive choke input power supply sits behind it.\u003c\/p\u003e\u003cp\u003eLike the 995R, the 994 runs in three modes. In Class AB it still uses significant quiescent current, and the high voltage supply enables the greatest output power the mode allows. In Class A the operating voltage is reduced and quiescent current raised so the output stage's current requirement is more or less constant with respect to signal; output falls to 20 watts rated into 8 ohms, the harmonic structure becomes richer and more fluid, and the amplifier runs significantly warmer. ecoA holds pure Class A the whole time music is being amplified, then drops quiescent current dramatically if no signal is detected for a minute, returning to Class A instantaneously.\u003c\/p\u003e\u003cp\u003eThe 994 is a mono amplifier and is used in pairs. Frequency response runs 2 Hz to 100 kHz within half a decibel, into a recommended load of 2 to 16 ohms. \u003cem\u003ehi-fi+\u003c\/em\u003e reviewed the 994 monos with the 914 preamplifier in May 2025.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated power (Class AB):\u003c\/strong\u003e 140 watts into 8 ohms; 200 watts into 4 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Class A power:\u003c\/strong\u003e 20 watts into 8 ohms; actual usable 30 watts into 8 ohms, 55 watts into 4 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModes:\u003c\/strong\u003e Class AB, Class A, ecoA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e hybrid; 6H6П grounded grid driving compound output stage; zero negative feedback; massive choke input power supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended load impedance:\u003c\/strong\u003e 2–16 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput:\u003c\/strong\u003e 1 RCA phono socket; 200 kohms; gain 31 dB; 1.1 V RMS for rated output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 2 Hz – 100 kHz +\/- 0.5 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistortion:\u003c\/strong\u003e less than 1% A weighted at rated output into 8 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e phase correct (non inverting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower consumption:\u003c\/strong\u003e below 1 W standby \/ 600 W maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e 190 x 365 x 312 mm (190 x 400 x 312 mm including connectors) \/ 25 kg per unit\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Default Title","offer_id":49211049738459,"sku":null,"price":30000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/Trilogy-Audio-April-2023-6_web.jpg?v=1788280023"},{"product_id":"trilogy-995r-mono-power-amplifier","title":"Trilogy 995R Mono Power Amplifier","description":"\u003cp\u003ePriced per pair. The 995R is a mono amplifier and is sold as a matched pair of monoblocks.\u003c\/p\u003e\u003cp\u003eThe 995R is Trilogy's statement mono power amplifier, brought to fruition after four years of research and in the range since 2018. Its form is monolithic and architectural, with machined fins optimised to dissipate heat across massive radiation surfaces. Two 6H6П valves serve as voltage amplifiers, while small linear MOSFETs working with twelve Japanese bipolars form the push-pull compound output stage.\u003c\/p\u003e\u003cp\u003eThe circuit has no feedback, is fully balanced, and uses a bridged output stage. That means the negative loudspeaker connection has no reference to earth, keeping a large return current from the loudspeaker out of the signal ground. A discrete selector button on the rear cycles through three modes. Class AB delivers 200 watts into 8 ohms. Class A drops the operating voltage and raises quiescent current for 40 watts into 8 ohms. ecoA holds pure Class A whenever music is playing and reduces bias when no signal is present, returning instantaneously.\u003c\/p\u003e\u003cp\u003eTASlink RJ45 sockets let connected Trilogy components communicate: run time, scheduling and amplifier status are read through a TASlink-enabled preamplifier. The 995R is a mono amplifier, used in pairs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated power (Class AB):\u003c\/strong\u003e 200 watts into 8 ohms; 350 watts into 4 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Class A power:\u003c\/strong\u003e 40 watts into 8 ohms; actual usable 55 watts into 8 ohms, 100 watts into 4 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModes:\u003c\/strong\u003e Class AB, Class A, ecoA, selected on the rear or over TASlink\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e hybrid; two 6H6П voltage amplifier valves; small linear MOSFETs with twelve Japanese bipolars in push-pull compound output; no feedback; fully balanced; bridged output stage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower supply:\u003c\/strong\u003e large shielded toroidal transformer, custom capacitors, full choke input supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 1 XLR 3-pin female (200 kohms, 2.25 V RMS); 1 RCA phono socket (50 kohms, 1.15 V RMS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e 25 dB balanced; 31 dB single ended\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended load impedance:\u003c\/strong\u003e 2–16 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 5 Hz – 100 kHz +\/- 0.5 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e phase correct (non inverting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower consumption:\u003c\/strong\u003e under 1 W standby \/ 1100 W maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e 190 x 460 x 350 mm \/ 38 kg per unit\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Default Title","offer_id":49211053834459,"sku":null,"price":60000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/34_new.jpg?v=1788280046"},{"product_id":"trilogy-906i-phono-stage","title":"Trilogy 906i Phono Stage","description":"\u003cp\u003eThe 906i brings as much of the 907's technology as possible to a lower price point. The signal path is free of cheap, off-the-shelf op-amp integrated circuits: the gain stages are single ended Class A and fully discrete, and each component was chosen for its audio performance alone. The high bandwidth, low distortion topology uses active current sources and cascode gain blocks with zero global feedback. RIAA equalisation is passive, implemented with precision components, and a DC servo removes the need for large value output capacitors.\u003c\/p\u003e\u003cp\u003eThe integral power supply is a low noise linear design with a custom transformer and quality branded reservoir capacitors — no switching wall-wart. The supply rails are shunt regulated. The component count is higher than the inexpensive series regulator IC usually found at this level, and the performance is far superior for it.\u003c\/p\u003e\u003cp\u003eSettings for moving magnet or moving coil gain and comprehensive cartridge loading are accessed by configuration switches on the base. Gain is switchable between 40 dB and 60 dB, input impedance is user adjustable from 47 kohms, and input capacitance is user adjustable from 100 pF. Frequency response tracks the RIAA curve from 20 Hz to 20 kHz within a quarter of a decibel. The 906i is hand made exclusively in England, with solid bespoke casework finished to the same standard as the rest of the range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e single box MM\/MC phono stage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e fully discrete single ended Class A; active current sources and cascode gain blocks; zero global feedback; passive RIAA EQ; DC servo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e 40 dB or 60 dB, user adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput impedance:\u003c\/strong\u003e 47 kohms, user adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput capacitance:\u003c\/strong\u003e 100 pF, user adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustment:\u003c\/strong\u003e configuration switches on the base\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs \/ outputs:\u003c\/strong\u003e 2 RCA phono sockets; output impedance 150 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response (to RIAA curve):\u003c\/strong\u003e 20 Hz – 20 kHz +\/- 0.25 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e phase correct (non inverting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower supply:\u003c\/strong\u003e integral low noise linear, custom transformer, shunt regulated rails; 4 W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e 140 x 220 x 48 mm (140 x 230 x 48 mm including connectors) \/ 1.7 kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Default Title","offer_id":49211056423131,"sku":null,"price":2000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/906i.3_crop.jpg?v=1788280095"},{"product_id":"trilogy-975-phono-stage","title":"Trilogy 975 Phono Stage","description":"\u003cp\u003eThe 975 is Trilogy's reference phono stage, a two box design with an external power supply. The main unit is housed in a machined billet weighing more than 5 kg, providing physical as well as electrical isolation for each circuit element. Each channel has an independently housed and isolated gain stage.\u003c\/p\u003e\u003cp\u003eThe topology is fully discrete and single ended, reaching high bandwidth and low distortion through active current sources and cascode gain blocks. Precision matched input transistor pairs keep noise very low. The common series regulator, usually chosen for simplicity, has been rejected in favour of discrete shunt regulators biased heavily into Class A for headroom; a shunt regulator can sink as well as source current, an advantage under the dynamic conditions music creates.\u003c\/p\u003e\u003cp\u003eDC for the regulators comes from the remote power supply, whose enclosure can be positioned to keep magnetic fields away from the active circuitry. Its custom mains transformer is a low current density design with a copper Faraday screen, feeding reservoir capacitors through a bespoke inductor to form a true choke input supply. Gain for moving magnet or moving coil and cartridge loading are set by configuration switches underneath.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e two box MM\/MC phono stage with external power supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e fully discrete single ended; active current sources and cascode gain blocks; precision matched input transistor pairs; discrete shunt regulators biased into Class A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower supply:\u003c\/strong\u003e external; low current density mains transformer with copper Faraday screen; bespoke inductor forming a true choke input supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e user adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput impedance:\u003c\/strong\u003e 47 kohms, user adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput capacitance:\u003c\/strong\u003e user adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustment:\u003c\/strong\u003e configuration switches underneath\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs \/ outputs:\u003c\/strong\u003e 1 pair RCA in; 1 pair RCA out; output impedance 150 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response (to RIAA curve):\u003c\/strong\u003e 20 Hz – 20 kHz +\/- 0.25 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e phase correct (non inverting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower consumption:\u003c\/strong\u003e 15 W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e main unit 270 x 312 x 56 mm \/ 6.8 kg; PSU 270 x 312 x 74 mm \/ 5.7 kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Default Title","offer_id":49211056816347,"sku":null,"price":15500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/trilogy-975-hero.png?v=1788279830"},{"product_id":"trilogy-931i-headphone-amplifier","title":"Trilogy 931i Headphone Amplifier","description":"\u003cp\u003eThe 931i is Trilogy's headphone amplifier — the 931, upgraded in 2019. The original brief was to keep the essential elements that made the 933 successful at a significantly lower cost. It is a fully discrete design with no generic integrated circuits, so Nic Poulson controls every crucial parameter of the active circuit and optimises it for this application alone. The small, light drivers in headphones sit very close to the ear and are ruthlessly revealing.\u003c\/p\u003e\u003cp\u003eThe audio circuit operates in pure single ended Class A with active constant current sources. Each channel has a single continuously biased output device, so the output is free from crossover distortion and the device is held at a constant temperature. An oversized linear power supply gives the active circuitry good operating headroom. Two stereo line inputs feed an audio grade ALPS volume control, and branded components are used throughout.\u003c\/p\u003e\u003cp\u003eThe output devices dissipate enough heat to need a heatsink. An extruded off-the-shelf part would have served; Trilogy uses a custom CNC machined one instead. Semiconductors are sensitive to mechanical vibration and their characteristics vary with temperature, so attaching the output devices to a high mass with a low resonant signature and large thermal inertia is worth the cost. Assembly is done entirely by hand in Trilogy's UK workshops. Standard finish is a soft natural silver, with lustrous paint finishes optional.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTopology:\u003c\/strong\u003e fully discrete, no integrated circuits; pure single ended Class A with active constant current sources; one continuously biased output device per channel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput power:\u003c\/strong\u003e 800 mW into 60 ohms; 200 mW into 300 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput impedance:\u003c\/strong\u003e 10 ohms or less\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 2 stereo line, 4 RCA phono sockets; 50 kohms or greater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolume control:\u003c\/strong\u003e audio grade ALPS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain (max):\u003c\/strong\u003e 18 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 20 Hz – 20 kHz +\/- 0.5 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistortion (THD):\u003c\/strong\u003e 0.05% or less, 10 mW into 300 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal to noise ratio:\u003c\/strong\u003e 85 dB A weighted or better\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e phase correct (non inverting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \/ weight:\u003c\/strong\u003e 140 x 237 x 50 mm \/ 1.7 kg; 16 W\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trilogy","offers":[{"title":"Default Title","offer_id":49211057537243,"sku":null,"price":2250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1363\/6553\/files\/931i-TONE2_2000px.jpg?v=1788280129"},{"product_id":"trilogy-h1-electrostatic-headphone-energiser","title":"Trilogy H1 Electrostatic Headphone Energiser","description":"\u003cp\u003eThe H1 is an energiser for electrostatic headphones and the first product from Trilogy's Special Products Division. SPD products are, by their nature, niche and limited in production run, and each one is hand assembled and tested by Nic Poulson personally. After trialling variations of the Stax circuit used by many other manufacturers, Poulson concluded that the accepted wisdom and circuitry could not advance the product to Trilogy's design goals, and started again.\u003c\/p\u003e\u003cp\u003eThe result is a pure Class A, fully balanced circuit with wide bandwidth and zero feedback. Two toroidal transformers are used, one for heating the triodes and one for the rest of the H1. The tube circuit uses high transconductance military specification tubes throughout — four 6C3П input tubes and two 6H6П output tubes. Wiring is Teflon coated point to point silver plated copper, and the PTFE\/Teflon output sockets have gold plated contacts, suiting Stax and similar electrostatic headphones at 580 volts bias.\u003c\/p\u003e\u003cp\u003eFour inputs — two RCA and two XLR — sit at the rear, with one pair of electrostatic sockets recessed into the front fascia. Two versions are made: a direct mode model (DMV), which selects inputs remotely, and a fully functioned remote version that adds volume, balance and mute. 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