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Thread: FS: superb three-ratio implementation of UTC A12 step-up transformer

  1. #1
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 3,791
    I'm Tom.

    Default FS: superb three-ratio implementation of UTC A12 step-up transformer

    Really hesitant to sell this but the gap between what I got for the EAR 912 and the phono stage I have my eye on is substantial and I need to try and fill it.

    For sale - the phono step-up transformer assembly that was made for me by Andrew Rothwell some time ago, using US-made UTC A12 transformers. There are cult objects in demand even over their Altec counterparts.

    There are literally dozens of ways these can be wired between their primary and secondary coils, in series and in parallel, to deliver all sorts of results, but Andrew got out his slide rule and his oscilloscope to work out both theoretically (by ratio) and by measurement (to optimise the quality of the signal) the ideal way to wire them as a multi-option step-up. He then executed them superbly in a unit that gives 1:12, 1:20 and 1:33 step-up, covering the bases for the vast majority of cartridges out there from 40 ohm Denon 103 to 2-6 ohm SPUs.

    The unit also has a bypass switch to enable it to be taken out of the loop if a MM cartridge is fitted.

    All up, with the purchase of the A12s from the US, postage and tax, and Andrewís time, effort and materials to do a custom job on these, Iím out a couple of hundred more than the £450 (including RMSD) Iím looking for for the unit. But I think thatís a fair price for a truly superb SUT that also (in my option anyway) also looks super cool.

    There was a thread on this a while back - since then Iíve used it with a Technics SL10 / Technics EPC310 moving coil cartridge in the study, and in the main rig with my Miyajimas and with a vintage 1960s Alnico SPU. It matched wonderfully with the SPU. https://theartofsound.net/forum/show...up-transformer Like all SUTs it repays careful placement, it worked silently after some trial and error in both my study and my main rig.







    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers with Tannoy ST50 supertweeters; Amp - Silvercore 833C monoblocks; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 9 inch and Ikeda IT-407 12 inch tonearms; Cartridges Stereo - Miyajima Madake, Miyajima Takumi, Ikeda 9TT, vintage Ortofon SPU GE; Mono - Miyajimas - Zero 0.7, Premium 1.0, Miyajima/Edison '78' 4.0 conical, and Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912 + Miyajima ETR-Mono SUT; 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: Sony TA-F3000ES; Digital: CDP Sony CDP-X3000ES & Arcam rBlink; Vinyl: Technics SL10 with Pickering TL-3.

  2. #2
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 3,791
    I'm Tom.

    Default

    Some more info on this as requested:

    The 1:12 input equates broadly speaking to an SUT that in Japanese SUT land would be labelled 40 ohm and is ideal for the Denon 103, some Benz models, certain Dynavectors and other highish impedance cartridges. The 40 ohms referred to is the coil impedance of the cartridge, not the SUT impedance.

    The 1:20 input equates broadly speaking to an SUT input that you might see labelled as 12-15 ohm and is ideal for a very large number of cartridges of fairly standard impedance of 10-20 ohm such as pretty much all of the AT stereo cartridges, and many many others. This is what I use with my Miyajima which is 15 ohm at the cartridge coil.

    The 1:33 input is for low impedance cartridges broadly in the range 2-7 ohms such as most Ortofon low output MC cartridges including Cadenza/Kontrapunkt series and all SPUs, Koetsu, Lyra, Ikeda, Fidelity Research, ZXY, Transfiguration and many others.

    As with everything SUT-related, there's a subjective element and you might prefer a cartridge run at the setting next to the suggested one above.

    This really is a very flexible phono step-up.
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers with Tannoy ST50 supertweeters; Amp - Silvercore 833C monoblocks; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 9 inch and Ikeda IT-407 12 inch tonearms; Cartridges Stereo - Miyajima Madake, Miyajima Takumi, Ikeda 9TT, vintage Ortofon SPU GE; Mono - Miyajimas - Zero 0.7, Premium 1.0, Miyajima/Edison '78' 4.0 conical, and Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912 + Miyajima ETR-Mono SUT; 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: Sony TA-F3000ES; Digital: CDP Sony CDP-X3000ES & Arcam rBlink; Vinyl: Technics SL10 with Pickering TL-3.

  3. #3
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 1,523
    I'm Adam.

    Default

    Super SUT, I’ve had the pleasure of listening to this. Very good quality.
    Glws
    "lack of passion is fatal"


    Vinyl: Garrard 401 with upgraded NWA bearing spindle, Russ Collinson 'shindo style' plinth / Tenuto gun metal mat / Townshend feet / SME-3012 j7 rewired / audio-technica ATP-12T - phonomac modified / STEREO: Jan Allaerts MC1 Boron/Shure M3D / Ortofon Royal N / Cartridge Man Music Master with isolator / Shure - SC35C (US) / SAEC C3 MC MONO: Miyajima Zero B 0.7mil mono / Denon DL102/ Ortofon Vintage SPU CG25 / Amps & SUTs: Radford STA25 mk3 / David Coe AD Audio 'Satchmo' pre & phono / Hashimoto HM-7 SUT / Carver MCt SUT (Jensen winding) / ETR-MONO SUT Digital: SW1X Audio Design DAC 1 signature / Roon / Tidal Speakers: Tannoy 12" MGs' in RFC custom 'Rutland' Cabinets with RFC custom crossovers / Tannoy ST-100 Super Tweeters Cables: Duelund DCA16GA tinned copper / Kimber 12TC / SW1X Audio Design USB-SPdif / Duelund DCA20GA interconnects / SW1X Audio SPDIF Aero 6 / Mains Power Conditioner / Box Furniture rack / Audiodesk Systeme Vinyl Cleaner / a very beautiful & understanding Wife!

    'when years of work on perfecting tone and technique suddenly drop away and a direct channel opens up between the musicianís brain and his or her fingers'

  4. #4
    Join Date: Aug 2010

    Location: Stroud, Gloucestershire , UK

    Posts: 654
    I'm Jake.

    Default

    Seconded.

    There’s a wonderful fluidity about the sound with this unit in the chain. If it had a Shindo or Miyajima badge on it would cost three times the amount Toms asking and I’m not sure it would sound any better.
    Technics SL-10/many carts or modded Sonos/Lampizator DAC - trilogy 907 or Aurorasound Vida - Phase Style 6SN7 preamplifier - Phase Style triode SE monoblocks - Ian's Frugal horn XL

  5. #5
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 3,791
    I'm Tom.

    Default

    This is now withdrawn I was looking for a quick and easy sale but itís proved to be more hassle than itís worth.
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers with Tannoy ST50 supertweeters; Amp - Silvercore 833C monoblocks; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 9 inch and Ikeda IT-407 12 inch tonearms; Cartridges Stereo - Miyajima Madake, Miyajima Takumi, Ikeda 9TT, vintage Ortofon SPU GE; Mono - Miyajimas - Zero 0.7, Premium 1.0, Miyajima/Edison '78' 4.0 conical, and Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912 + Miyajima ETR-Mono SUT; 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: Sony TA-F3000ES; Digital: CDP Sony CDP-X3000ES & Arcam rBlink; Vinyl: Technics SL10 with Pickering TL-3.

  6. #6
    Join Date: Mar 2014

    Location: KY - Scotland

    Posts: 4,137
    I'm Mike.

    Default

    Just a couple of months too late for me, bought Jimbo's K&K, I'm sure this would be superior but I've really gone way way over what I had intended to spend on HiFi and with three trips abroad to fund this year I'm trying to be good

    I've seen so much kit I lusted after come up for sale AFTER I've bought something else in the last year or so, just need to look at the number of valve amps that have been for sale recently and when I was after one there were virtually none.

    C'est La Vie

    Do you take monthly payments?

    PS: can't remember but was this one of the ones you loaned to me a while back?

  7. #7
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 1,523
    I'm Adam.

    Default

    Quote Originally Posted by montesquieu View Post
    This is now withdrawn I was looking for a quick and easy sale but it’s proved to be more hassle than it’s worth.
    Oh dear! Sorry to hear that
    "lack of passion is fatal"


    Vinyl: Garrard 401 with upgraded NWA bearing spindle, Russ Collinson 'shindo style' plinth / Tenuto gun metal mat / Townshend feet / SME-3012 j7 rewired / audio-technica ATP-12T - phonomac modified / STEREO: Jan Allaerts MC1 Boron/Shure M3D / Ortofon Royal N / Cartridge Man Music Master with isolator / Shure - SC35C (US) / SAEC C3 MC MONO: Miyajima Zero B 0.7mil mono / Denon DL102/ Ortofon Vintage SPU CG25 / Amps & SUTs: Radford STA25 mk3 / David Coe AD Audio 'Satchmo' pre & phono / Hashimoto HM-7 SUT / Carver MCt SUT (Jensen winding) / ETR-MONO SUT Digital: SW1X Audio Design DAC 1 signature / Roon / Tidal Speakers: Tannoy 12" MGs' in RFC custom 'Rutland' Cabinets with RFC custom crossovers / Tannoy ST-100 Super Tweeters Cables: Duelund DCA16GA tinned copper / Kimber 12TC / SW1X Audio Design USB-SPdif / Duelund DCA20GA interconnects / SW1X Audio SPDIF Aero 6 / Mains Power Conditioner / Box Furniture rack / Audiodesk Systeme Vinyl Cleaner / a very beautiful & understanding Wife!

    'when years of work on perfecting tone and technique suddenly drop away and a direct channel opens up between the musicianís brain and his or her fingers'

  8. #8
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 3,791
    I'm Tom.

    Default

    Quote Originally Posted by WESTLOWER View Post
    Oh dear! Sorry to hear that
    oops ... it was the CDP I decided to withdraw.

    this is STILL AVAILABLE

    Quote Originally Posted by mikeyb View Post
    can't remember but was this one of the ones you loaned to me a while back?
    yes it was.
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers with Tannoy ST50 supertweeters; Amp - Silvercore 833C monoblocks; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 9 inch and Ikeda IT-407 12 inch tonearms; Cartridges Stereo - Miyajima Madake, Miyajima Takumi, Ikeda 9TT, vintage Ortofon SPU GE; Mono - Miyajimas - Zero 0.7, Premium 1.0, Miyajima/Edison '78' 4.0 conical, and Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912 + Miyajima ETR-Mono SUT; 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: Sony TA-F3000ES; Digital: CDP Sony CDP-X3000ES & Arcam rBlink; Vinyl: Technics SL10 with Pickering TL-3.

  9. #9
    Join Date: Mar 2014

    Location: KY - Scotland

    Posts: 4,137
    I'm Mike.

    Default

    Quote Originally Posted by montesquieu View Post
    oops ... it was the CDP I decided to withdraw.

    this is STILL AVAILABLE



    yes it was.
    Thanks, can't remember if it suited my setup or not.

  10. #10
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 3,791
    I'm Tom.

    Default

    Quote Originally Posted by mikeyb View Post
    Thanks, can't remember if it suited my setup or not.
    Looking back you said that it took away the edginess issues you were having with a particular cartridge but in the end you decided to sell the phono stage and try something else.
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers with Tannoy ST50 supertweeters; Amp - Silvercore 833C monoblocks; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 9 inch and Ikeda IT-407 12 inch tonearms; Cartridges Stereo - Miyajima Madake, Miyajima Takumi, Ikeda 9TT, vintage Ortofon SPU GE; Mono - Miyajimas - Zero 0.7, Premium 1.0, Miyajima/Edison '78' 4.0 conical, and Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912 + Miyajima ETR-Mono SUT; 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: Sony TA-F3000ES; Digital: CDP Sony CDP-X3000ES & Arcam rBlink; Vinyl: Technics SL10 with Pickering TL-3.

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