Lol
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Galvanic isolation obviously has a big effect.
http://www.whatsbestforum.com/showth...anic-isolation
Potential Jitter issues with USB isolation? Jesus!, it's a mine field.
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
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
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
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...
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
I think it was a Tesla and you were interested in trying a WE 396A?
https://theartofsound.net/forum/show...ric-396A-valve