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Thread: Xiang Sheng valve output modifications

  1. #21
    Bigman80 Guest

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    Lol
    Quote Originally Posted by Jimbo View Post
    I would like someone to explain to me how it is done.

  2. #22
    Join Date: Jan 2013

    Location: Birmingham

    Posts: 6,772
    I'm James.

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    Galvanic isolation obviously has a big effect.

    http://www.whatsbestforum.com/showth...anic-isolation

  3. #23
    Bigman80 Guest

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    Potential Jitter issues with USB isolation? Jesus!, it's a mine field.

  4. #24
    Join Date: Apr 2010

    Location: London, UK

    Posts: 13

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    Hi Alan , I have bought Xiang Sheng dac , would be very grateful if you can advice me on the same modifications as you did regarding anode voltage - I sent you two messages on the forum but maybe some problems with service ? Thank you . Best regards . Val

  5. #25
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 6,089
    I'm Alan.

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    Hi Val, this was over 5 years ago, i don't have the Dac anymore so can't refer to any visual clues.

    I removed the shunt regulator consisting of a 75V zener and a transistor, I think an E13005.
    I'm guessing I left the main smooting capacitor after the HT bridge rectifier (I have a 150uF shown on my scribbled circuit) then added a 1K/90uF RC filter to provide approx 120V HT on load. 100uF is a more common value.

    Hope this helps,
    Cheers
    I love Hendrix for so many reasons. He was so much more than just a blues guitarist - he played damn well any kind of guitar he wanted. In fact I'm not sure if he even played the guitar - he played music. - Stevie Ray Vaughan

  6. #26
    Join Date: Apr 2010

    Location: London, UK

    Posts: 13

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    Hi Alan , thank you for your reply - very grateful , i still waiting for delivery from China , can I send you a photo of the dac inside when it's arrived ? This model with different chip , but same valve - I would be guessing that the same circuit ? I have plenty of 5670/2c51c valves when I bought Havana dac many yers ago , and 120v ht what you get after mods is very close to optimal working condition for this type of valve - which is 135v i think ? This is an old thread - if its possible - could you please send me your contact details in message and I can send you a photo . Thank you very much again . Best wishes . Val

  7. #27
    Join Date: Feb 2013

    Location: W Lothian

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    I'm Grant.

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    ive still got my dac somewhere in spare room in a box with fancy valve... it was so long ago i cant remember what valve it was but it is a v good dac. one day when the room gets cleared i might find it again...
    Regards,
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  8. #28
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 6,089
    I'm Alan.

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    Quote Originally Posted by val View Post
    if its possible - could you please send me your contact details in message and I can send you a photo . Thank you very much again . Best wishes . Val
    Just send by PM, I did receive your previous messages, just hadn't found the info.
    I love Hendrix for so many reasons. He was so much more than just a blues guitarist - he played damn well any kind of guitar he wanted. In fact I'm not sure if he even played the guitar - he played music. - Stevie Ray Vaughan

  9. #29
    Join Date: Apr 2010

    Location: London, UK

    Posts: 13

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    Hi Alan , thank you for your reply , but I didn't have message in my box , and I didn't have notifications about sent messages too , maybe admin/moderators can help ? Thank you in advance

  10. #30
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 6,869
    I'm Lawrence.

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    Quote Originally Posted by struth View Post
    ive still got my dac somewhere in spare room in a box with fancy valve... it was so long ago i cant remember what valve it was but it is a v good dac. one day when the room gets cleared i might find it again...
    I think it was a Tesla and you were interested in trying a WE 396A?

    https://theartofsound.net/forum/show...ric-396A-valve

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