Our Collection
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Brand
- Abendrot
- Audeze
- Audioquest
- Audio Research
- AVM
- The Bespoke Audio Company
- Brinkmann Audio
- The Chord Company
- Constellation Audio
- Dan D'Agostino
- DCS
- Devialet
- Dynavector
- Exogal
- Focal
- Harbeth
- Jadis
- Klaudio
- Koetsu
- Krell
- Kronos
- Linn
- Lumin
- Lyra
- Magico
- Magnepan
- Martin Logan
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McIntosh
- C70 Valve Preamplifier
- MA252 Hybrid Integrated Amplifier
- MA5300 Integrated Amplifier
- MC2152 Valve Power Amplifier
- MC462 Stereo Power Amplifier
- MHA150 Headphone Amplifier
- MP100 Phono Preamplifier
- C2600 Valve Preamplifier
- MA9000 Integrated Amplifier
- MC1.2KW Monoblock
- MC452 Stereo Power Amplifier
- MCD550 CD Player
- Melco
- Metronome
- Michell Engineering
- Naim Audio
- Pathos
- REL Acoustics
- Shunyata Research
- Sonus Faber
- Soulution
- Stax
- Tangerine Audio
- Tellurium Q
- Transparent
- Unison Research
- Vertere
- Wilson Audio
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Ex-Demo / Pre-Owned
- Audio Research CD8 (Pre-owned)
- Audio Research CD9 DAC (Ex-demo)
- Audio Research LS28 Preamplifier (Ex-demo)
- Audio Research Reference 6 Preamplifier (Ex-demo)
- Audioquest Niagara 5000 Mains Conditioner (Ex-demo)
- Audioquest Niagara 7000 Mains Conditioner (Ex-demo)
- DCS Debussy DAC (Ex-demo)
- Focal Diablo Utopia w/ Stands (Ex-demo)
- Focal Grande Utopia EM Loudspeakers (Ex-Demo)
- Focal Sopra No3 Loudspeakers (Ex-demo)
- Krell Duo 300 Power Amplifier (Pre-owned)
- Krell Kid (Pre-owned)
- Krell S-1200 3D Sound Processor (Pre-Owned)
- Linn Akurate DS Streamer (Ex-demo)
- Martin Logan Classic ESL9 (Ex-demo)
- McIntosh MX122 AV Processor (Ex-demo)
- Metronome Le Player 2S CD Player (Ex-demo)
- Sonus Faber Olympica 2 (Ex-demo)
- Transparent Reference Speaker Cable 8ft (Ex-Demo)
- Unison Research Triode 25 (Ex-demo)
- Vertere Phono-1 Phono Stage (Pre-owned)
- Wilson Audio Sasha 2 (Ex-demo)
- Wilson Audio Sasha 2 Speakers (Pre-owned)
- Focal Sub Air (Ex-Demo)
- Linn Akurate 2200 Power Amplifier (Ex-Demo)
- Roksan Oxygene Integrated Amplifier
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Type
- Active Speakers
- AV Processor
- Mains Conditioning
- Record Cleaners
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Room Correction
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FM Tuner
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Cables
- Alpha EF Mains Cable
- Alpha NR Mains Cable
- Delta EF Mains Cable
- Delta NR Mains Cable
- Sigma NR Mains Cable
- Transparent Reference Speaker Cable 8ft (Ex-Demo)
- Venom HC Mains Cable
- Audioquest Cable Range
- ChordMusic Cable Range
- Tellurium Q Cable Range
- Sarsen speaker cable
- Balanced Reference
- C-stream Ethernet cable
- Balanced MusicLink Super
- Balanced MusicLink
- Crimson VEE 3 stereo RCA interconnect
- MusicWave
- MusicWave Super
- Optichord toslink to toslink digital optical interconnect
- Prodac VEE3 digital interconnect
- Reference Speaker Cable
- USB SilverPlus digital interconnect
- Headphone Amplifiers
- Master Clock
- Power Supplies
- All In One System
- Digital Music Player
- Headphones
- MC Cartridge
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MM Cartridge
- Phono Stage
- Media Server
- Tonearm
- Turntable
- Valves
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Amplifiers
- 311 Stereo Power Amplifier
- 330 Integrated Amplifier
- 511 Stereo Power Amplifier
- 701 Mono Amplifier
- 711 Stereo Power Amplifier
- Expert 140 Pro
- Expert 210 Pro Dual
- Krell Duo 300 Power Amplifier (Pre-owned)
- MA252 Hybrid Integrated Amplifier
- MA5300 Integrated Amplifier
- MC2152 Valve Power Amplifier
- MC462 Stereo Power Amplifier
- Unison Research Triode 25 (Ex-demo)
- Duo 175
- GSi75 Integrated Amplifier
- Expert 1000 Pro Dual
- Linn Akurate 2200 Power Amplifier (Ex-Demo)
- MA9000 Integrated Amplifier
- MC452 Stereo Power Amplifier
- Momentum Integrated Amplifier
- NAP 500 POWER AMPLIFIER
- Original d'Atelier
- Roksan Oxygene Integrated Amplifier
- Simply Italy
- Statement
- Triode 25
- Foundation
- Akurate 4200
- Akurate 2200
- Centaur Stereo
- Momentum Stereo
- NAP 100
- NAP 200
- NAP 250
- NAP 300
- SUPERNAIT2
- Unico Primo
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Pre Amplifiers
- 325 Preamplifier
- 525 Preamplifier
- 725 Preamplifier
- Audio Research LS28 Preamplifier (Ex-demo)
- Audio Research Reference 6 Preamplifier (Ex-demo)
- C70 Valve Preamplifier
- LS28 PRE-AMPLIFIER
- C2600 Valve Preamplifier
- Illusion II
- NAC 552
- Preamplifier
- Reference 6 Pre-Amplifier
- Momentum Preamplifier
- NAC 202
- Nac 252
- Nac 282
- Reference 5 SE
- Virgo II
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CD Players
- Audio Research CD8 (Pre-owned)
- Audio Research CD9 DAC (Ex-demo)
- Metronome Le Player 2S CD Player (Ex-demo)
- Rossini CD / SACD Transport
- Le Player
- MCD550 CD Player
- Vivaldi CD/SACD Transport
- CD5si
- Metronome Calypso
- Metronome Calypso Reference
- Metronome CD8 Signature
- Metronome Kalista Ultimate SE
- Metronome T5 Signature
- Unico CD Primo
- DACs
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Speakers
- .7
- 30.2 40th Anniversary Edition
- 40th Anniversary Super HL5+
- A3
- Classic ESL 9
- Expression ESL13A
- Focal Diablo Utopia w/ Stands (Ex-demo)
- Focal Grande Utopia EM Loudspeakers (Ex-Demo)
- Focal Sopra No3 Loudspeakers (Ex-demo)
- Kanta No 2
- Maestro Utopia III Evo
- Martin Logan Classic ESL9 (Ex-demo)
- P3 ESR 40th Anniversary Edition
- Scala Utopia III Evo
- Sonus Faber Olympica 2 (Ex-demo)
- TuneTot
- Wilson Audio Sasha 2 (Ex-demo)
- Wilson Audio Sasha 2 Speakers (Pre-owned)
- Amati Tradition
- Electromotion ESL-X
- Guarneri Tradition
- Harbeth Super HL5 Plus
- Il Cremonese
- M3
- Monitor 40.2
- Sabrina
- Sasha 2
- Serafino Tradition
- Sopra No.2
- Sopra No.3
- Yvette
- S3 MkII
- 1.7i
- 3.7i
- Grande Utopia EM
- Harbeth P3ESR
- Harbeth Compact 7ES-3
- Harbeth 30.1
- Electromotion FX2
- Electromotion ESL
- Alexandria XLF
- Alexia 2
- Aria 948
- Diablo Utopia
- Duette
- CLX Art
- Q7 Mk II
- S1 MkII
- S5 MkII
- Majik 109
- Majik 140
- Olympica I
- Olympica II
- Olympica III
- Aida
- Venere Center
- Venere 1.5
- Venere 2.5
- Stella Utopia EM
- Sub Utopia EM
- Venere 3.0
- Viva Utopia
- Mono Amplifiers
- Subwoofers
- Center Channel
This is our ex-demonstration model in immaculate condition. We have the original packaging and accessories.
This was first purchased in July 2015.
The Triode 25 was born out of the huge success of the long-standing Triode 20 amplifier, and released as part of the 25th anniversary celebrations of Unison Research's formation. It's been developed over an extended period to ensure it is a worthy successor to the Triode 20's name.
Like its predecessor, the Triode 25 is a push-pull amplifier that utilizes EL34 tubes in the output stage. The push-pull circuit includes a final stage with two power tubes intended for the amplification of the audio signal, and is then followed by a symmetrical output transformer stage that reconstructs the signal into a high-quality linear wave.
Using a push-pull structure in this amplifier design allows for numerous benefits, including higher-output power compared to single-ended designs, improved efficiency and no static polarization of the output transformer for greater performance in the output section. However, for this to work well it is essential that all the individual amplification stages are carefully designed and constructed to prevent the formation of dangerous and compromising odd-order harmonic distortion. This is true for the two semi-output amplifiers, and even more important in the output transformer.
The Triode 25 can operate in two modes: triode and pentode. The latter is capable of delivering a maximum power output of over 45 watts per channel (6Ω load) with minimal harmonic distortion across the entire audio band.
With the use of an Apple lightning to USB connector (not included) you can plug your iPhone/iPod/iPad directly into the Triode 25's DAC and play your hi-res music files straight from your device.
The addition of a USB input modernises the Triode 25 and increases its appeal to the growing world of computer audiophiles, who use their laptop or computer as a high-quality audio source for their hi-fi. The USB input is 32-bit/384kHz and DSD 128 compliant to support the latest standards in studio quality audio.
Ex-Demo / Pre-Owned range
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Ex-Demo / Pre-Owned