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Thread: Tubehunter Class D Stereo Power Amplifier

  1. #1
    Join Date: Mar 2017

    Location: London N2

    Posts: 629
    I'm Edward.

    Default Tubehunter Class D Stereo Power Amplifier

    Today I got one of Duncan's (Tubehunter) class D amps which he was flogging the other day. Amp based on modules from Sure Electronics.

    Switched out my Radford STA25 and inserted the Class D Amp - and Wow! Amazing ...

    Had a few hours of settling in and these are singing very sweetly. Wide open, fast and just 'grips' the music. Very precise sound with nice balance across the dynamic range. An easy non fatiguing listen, especially once warmed up. I rather expect that over the next days they will settle in more.

    Honestly I'm shocked how musical this amp is, not as sweet/warm perhaps as my Radford STA25, but still very engaging with lots of depth and 'presentation' - really quite the opposite of what one generally expects of a Class D amp - normally expected to be thin sounding and whatnot.

    Just saying ...
    Source: Win10 server, Win10 Mini-ITX Renderer running JRiver & Tidal/Roon
    DAC / Preamp: Perreaux DP32, Secondary DAC:
    Chevron Paradox
    Amp: Radford Revival STA25, TubeHunter Class D IRS2092
    Speakers:, Tannoy Eatons, Kudos Cardea C2, BatPure Supertweeters, Acoustic Research 8BX (modded)
    Power Conditioner: ISOtek Qube 1kw
    Currently resting: Radford Revival Prototype preamp, Paul Baldwin 405C amp, PMC LB1 Signature

  2. #2
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 701
    I'm Adam.

    Default

    Damn ! Missed out on one of these.
    Glad you got one Edward, I'd like to hear it
    When I next drop by.
    "lack of passion is fatal"
    LP12, Kore, Lingo2, Aro, SKale / DV XX2Mk2 / Garrard 401 / SME 3012 J7 Rewired / Ortofon Vintage SPU GE /Shure M3D /
    WAD 300b Power modded, TJ Mesh Plate Valves / David Coe AD Audio 'Satchmo' Pre & Phono / Hashimoto HM-7 SUT / Tannoy 12" MGs in RFC Custom Rutland Cabinets with RFC Custom Crossovers
    Speaker Cables: Duelund DCA16GA Tinned Copper / Rpi3 & Digi + pro / SW1X Audio Design USB-SPdif / SW1X Audio Design DAC 1 Signature / Interconnects: Duelund DCA20GA home brew /
    SW1X Audio Phono SPDIF AERO 6 / David Coe AD Audio Silver USB / Synology NAS Drive / Roon / Tidal HiFi

  3. #3
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 2,821
    I'm Tom.

    Default

    Funny I was going to post something similar (and I also have an STA25 Mk3 in the main system at the moment)

    This is driving a pair of Tannoy DC6es in my study, preamp is a rather nicely specced Pass B1.

    It sounds very nice indeed, very musical, warm, engaging. I'm rather impressed. I will give it a go in the main rig at some point though the study will be its home. It's replacing a 2024 Tripath I also got from Duncan and while I really liked that amp this is most definitely an improvement. Very grown up sound and not in the least grainy or cold which you sometimes get from digital.
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers; Amp - Radford STA100; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 / Ortofon 309 Limited tonearms; Cartridges Stereo - Miyajima Madake, Ortofon SPU Royal N + Shure M3D Jico stylus; Mono - Miyajimas - Zero 0.7, Premium 1.0 retipped by Ana Mighty Sound bamboo cantilever, Spirit '78' 3.0 conical from Ana, also vintage GE VRII, Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912; Esoteric Sound Re-Equalizer for equalisation of early mono and 78, switchable in from tape loop; Digital: Audio Note CDT2/II transport, heavily modded AN Kit DAC + Mutec MC3+USB.

    Study: Speakers - Tannoy DC6; Amp: Duncan 'Tuberhunter' 200w class D; preamp - Pass DCB1; Vinyl: Garrard 401 with AT1503 tonearm and vintage SPU-GE; SUTs - Ortofon 2-15k & Bob's Devices; Phono Stage: Schiit Mani; Digital - Trichord Genesis III CDP + Arcam rBlink; Schiit Multibit DAC.

  4. #4
    Join Date: Mar 2017

    Location: London N2

    Posts: 629
    I'm Edward.

    Default

    Quote Originally Posted by WESTLOWER View Post
    Damn ! Missed out on one of these.
    Glad you got one Edward, I'd like to hear it
    When I next drop by.
    Anytime Adam. In fact you can borrow it when you get your speaker project up and running.

    You back in London or still on hols?
    Source: Win10 server, Win10 Mini-ITX Renderer running JRiver & Tidal/Roon
    DAC / Preamp: Perreaux DP32, Secondary DAC:
    Chevron Paradox
    Amp: Radford Revival STA25, TubeHunter Class D IRS2092
    Speakers:, Tannoy Eatons, Kudos Cardea C2, BatPure Supertweeters, Acoustic Research 8BX (modded)
    Power Conditioner: ISOtek Qube 1kw
    Currently resting: Radford Revival Prototype preamp, Paul Baldwin 405C amp, PMC LB1 Signature

  5. #5
    Join Date: Mar 2017

    Location: London N2

    Posts: 629
    I'm Edward.

    Default

    Quote Originally Posted by montesquieu View Post
    Funny I was going to post something similar (and I also have an STA25 Mk3 in the main system at the moment)

    This is driving a pair of Tannoy DC6es in my study, preamp is a rather nicely specced Pass B1.

    It sounds very nice indeed, very musical, warm, engaging. I'm rather impressed. I will give it a go in the main rig at some point though the study will be its home. It's replacing a 2024 Tripath I also got from Duncan and while I really liked that amp this is most definitely an improvement. Very grown up sound and not in the least grainy or cold which you sometimes get from digital.

    I've already mentioned to Duncan that I may ask him to build some monoblocks based on these modules/amps. Today's experience takes me closer to that idea.
    Source: Win10 server, Win10 Mini-ITX Renderer running JRiver & Tidal/Roon
    DAC / Preamp: Perreaux DP32, Secondary DAC:
    Chevron Paradox
    Amp: Radford Revival STA25, TubeHunter Class D IRS2092
    Speakers:, Tannoy Eatons, Kudos Cardea C2, BatPure Supertweeters, Acoustic Research 8BX (modded)
    Power Conditioner: ISOtek Qube 1kw
    Currently resting: Radford Revival Prototype preamp, Paul Baldwin 405C amp, PMC LB1 Signature

  6. #6
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 33,698
    I'm Geoff.

    Default

    Quote Originally Posted by montesquieu View Post
    Very grown up sound and not in the least grainy or cold which you sometimes get from digital.
    It's not digital Tom.

    Class D and the older Tripath amps are analogue. They use high speed switching to construct the waveform envelope. Rather like AM radio.

  7. #7
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 1,385
    I'm Lawrence.

    Default

    I was mulling over these too, but in the end decided I didn't need it having a good ice power amp. Would still like to hear it though.

    The Virgos are sounding great on the end of my Ariand/Yarland EL34 amp now if you want to hear them. So much so I've arranged to buy the later version of the amp with switchable pentode/triode mode.

    Sent from my NEM-L51 using Tapatalk

  8. #8
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 701
    I'm Adam.

    Default

    Thanks Edward, back in the Smoke now.Trying to stop the Mrs. doing the sums to sell up and go to Cornwall, she does this wherever we go!
    Quote Originally Posted by Edwardlon View Post
    Anytime Adam. In fact you can borrow it when you get your speaker project up and running.

    You back in London or still on hols?
    "lack of passion is fatal"
    LP12, Kore, Lingo2, Aro, SKale / DV XX2Mk2 / Garrard 401 / SME 3012 J7 Rewired / Ortofon Vintage SPU GE /Shure M3D /
    WAD 300b Power modded, TJ Mesh Plate Valves / David Coe AD Audio 'Satchmo' Pre & Phono / Hashimoto HM-7 SUT / Tannoy 12" MGs in RFC Custom Rutland Cabinets with RFC Custom Crossovers
    Speaker Cables: Duelund DCA16GA Tinned Copper / Rpi3 & Digi + pro / SW1X Audio Design USB-SPdif / SW1X Audio Design DAC 1 Signature / Interconnects: Duelund DCA20GA home brew /
    SW1X Audio Phono SPDIF AERO 6 / David Coe AD Audio Silver USB / Synology NAS Drive / Roon / Tidal HiFi

  9. #9
    Join Date: Jul 2011

    Location: Northamptonish

    Posts: 1,593
    I'm Peter.

    Default

    Quote Originally Posted by WESTLOWER View Post
    Thanks Edward, back in the Smoke now.Trying to stop the Mrs. doing the sums to sell up and go to Cornwall, she does this wherever we go!
    Take her to Middlesbrough in February for your next holiday, Adam, that'll cure her

  10. #10
    Join Date: Aug 2012

    Location: South Beds, UK

    Posts: 1,048
    I'm kickinbacklistenintotchoons.

    Default

    Having now listened for a couple of weeks, my write up on my one of these (a little different, as it has a 500 VA Traffo) is, "For sale, one Quad 405-2, in excellent condition".
    My stuff -

    Analogue: Technics SL-7 / EPC-P202C
    For when there's no Analogue: Doge 6 CDP
    To discover loads of new music: Spotify via Laptop into Xiang Sheng DAC-01A
    Make music louder: Quad 34 pre, 200W/side Class D (IRS2092) power
    Music boxes: Heco Celan 300
    Cleaning duties: Okki Nokki 2

    Y'know, sometimes, Satan, come as a man of peace.

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