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Thread: Wanted: Pass B1

  1. #1
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 2,243
    I'm Tom.

    Default Wanted: Pass B1

    Yes I know I know .. I've bought and sold three or four of these over the years but I'm looking for another one.

    Far beyond my meagre capabilities to build one, sadly.

    Anyone got one lying around unused?
    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.

  2. #2
    Join Date: Apr 2010

    Location: Bristol

    Posts: 257
    I'm Chris.

    Default

    You and 'Lord Mortlock' both! You may both have owned my old 'Morfaudio' one. Good luck- from a Pass fan.

    (Currently on a battery-powered Stereo Coffee LDR Pre-amp into an F3)
    Chris.

  3. #3
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 2,243
    I'm Tom.

    Default

    Quote Originally Posted by hornucopia View Post
    You and 'Lord Mortlock' both! You may both have owned my old 'Morfaudio' one. Good luck- from a Pass fan.

    (Currently on a battery-powered Stereo Coffee LDR Pre-amp into an F3)
    Yes I had that one.

    I don't like having kit lying around unused so I sold it ... stupid of me really.
    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: Dec 2010

    Location: Surrey

    Posts: 95
    I'm jp.

    Default

    This one look is nice, hot rod and some Gucci components.
    http://www.diyaudio.com/forums/swap-...met-build.html

  5. #5
    Join Date: Oct 2012

    Location: NE England

    Posts: 4,643
    I'm Jez.

    Default

    I can make you one. Or an Arkless one. Or a Lindsey Hood one. Or a diamond buffer or... lots of other variations. All just buffers

  6. #6
    Join Date: Jan 2009

    Location: Essex

    Posts: 16,452
    I'm openingabottleofwine.

    Default

    Quote Originally Posted by Arkless Electronics View Post
    I can make you one. Or an Arkless one. Or a Lindsey Hood one. Or a diamond buffer or... lots of other variations. All just buffers
    The circuit of the Pass is very simple. I might build one myself - if I knew what the J-fets were!

    http://www.dms-audio.com/node/19
    Have you listened to this month's choice in the Album Club?

    Barry

  7. #7
    Join Date: Jan 2009

    Location: Essex

    Posts: 16,452
    I'm openingabottleofwine.

    Default

    Quote Originally Posted by diceman View Post
    This one look is nice, hot rod and some Gucci components.
    http://www.diyaudio.com/forums/swap-...met-build.html
    200 seems reasonable, given the build and component quality. Might be too late though as the seller is about to cannibalise it for parts. (As of 7.08.17)
    Have you listened to this month's choice in the Album Club?

    Barry

  8. #8
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 2,243
    I'm Tom.

    Default

    Made contact on that one hope it's still available.
    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.

  9. #9
    Join Date: Apr 2012

    Location: London

    Posts: 199
    I'm james.

    Default

    I have one, unused, a dc coupled kit variant, can't remember much about it tbh but it is in a tidy case and properly built.

    Sent from my GT-I9195 using Tapatalk

  10. #10
    Join Date: Oct 2012

    Location: NE England

    Posts: 4,643
    I'm Jez.

    Default

    Quote Originally Posted by Barry View Post
    The circuit of the Pass is very simple. I might build one myself - if I knew what the J-fets were!

    http://www.dms-audio.com/node/19
    Yeah it's just a textbook zero offset FET (assuming matched FETs) buffer and shouldn't really be called a Pass anything.... One will find it in text books from 40 years ago! It uses the unfortunately discontinued 2SK170. A new version is now available from Linear Systems as the LSK170 but at a much higher price than the original. The only issue is that if using it DC coupled then the matching of the FETs is important. FET's are notoriously variable from one to another so if going for excellent matching many FET's will need to be bought and selected into matched pairs. Not too bad if they were 15P but at more like 3 each....

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