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Old 13th March 2010, 03:45 PM   #1
Sandor is offline Sandor  Italy
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Default AD1865-based dac schematic

I'm searching for the schematic of a ad1865-based dac from Yuri Gelgor. This dac used a 6H30 tube and two Sowter transformers in the output stage. It seems that the related web pages are no longer available. Could anyone help me?
Regards.

Paul
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Old 13th March 2010, 04:03 PM   #2
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by Sandor View Post
I'm searching for the schematic of a ad1865-based dac from Yuri Gelgor.
This One?:

http://freenet.am/~audio/uriy.htm

Ciao T
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Old 13th March 2010, 07:56 PM   #3
Sandor is offline Sandor  Italy
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Yes, it is. Thank you very much.
What's your opinion about that balanced output stage and how does it compare to a SRPP? Is that schema suitable for use with a ES9018 chip?
Welcome back.

Paul
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Old 13th March 2010, 08:46 PM   #4
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I will do a copy of the schematics which is a different version of the 6H30 PP. I think the version of the current web site does not work due to supply voltage of the tube ( -170, + 170v). The last version shows resistor to cathode and +95v as power supply of the 6H30 thu thransformer.
Regards
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Old 15th March 2010, 11:07 PM   #5
Sandor is offline Sandor  Italy
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In that "retro dac" I do not understand well the anode power supply circuit. Isn't that 15K cathode resistor too high?
I've also found another version of this circuit with a more traditional +90V anode supply and a 2k2 cathode resistor (which, again, seems too high).
Retro - DAC
Is this circuit newer or older?
Regards.

Paul
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Old 16th March 2010, 11:46 AM   #6
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Default DAC AD1865 with 6H30 PP from Yury

here is what I found on the Geocities WEB site few months ago.
6H30 PP is polarised with resistor ( 2.2K in the component list). Power supply is 95v. Based on the 6H30 curves I believe that might be around 20 or 30mA in each triode : so the cathode resistor might be around 200 ohms which will provide around 4 to 5 v as -Vg.
I ordered the sowter transformer ! I will try the schematics as soon as I'll receive it from UK. Keep you posted if you are interested. Any advice is welcome.
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Old 16th March 2010, 11:59 AM   #7
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Ciao Sandor
I have posted a message on the site, but I am a beginer on DIY, ...not sure it was visible.
I did copy of my doc . I agree that resistor might be lower ( around 200, 300 ohms) to provide around 4 to 5 volts with 20 to 30 mA. 95v as PS sounds ok. I am using this tube in a different version ( capacitor). 6H30PI sounds great. I ordered the Sowter transformer and will build this pream from M Yury.
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Old 16th March 2010, 06:08 PM   #8
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by Sandor View Post
What's your opinion about that balanced output stage and how does it compare to a SRPP?
Having not build this circuit I cannot possibly comment, sorry.

Quote:
Originally Posted by Sandor View Post
Is that schema suitable for use with a ES9018 chip?
ESS declines to make any useful technical information on their DAC's available publicly.

Any Datasheets given out are subject to extremely draconian NDA's and so I do not have any (or if I did I could not admit so in Public).

But as the ESS Chips are very different to the AD Chips used in the design by Yuri, it stands to reason that Yuri's design will work very well with the AD1865, but probably not at all well with the ESS DAC.

That is unless substantial changes are made, which would require knowledge about the workings of the ESS DAC which ESS declines to make available to the general public.

Sorry not to be of more help there.

Ciao T
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Old 16th March 2010, 07:01 PM   #9
Sandor is offline Sandor  Italy
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Many thanks to Pat93 and Thorsten.

Path93, no schematic is visible on your post.
Could you, please, try once again?
Regards.

Paul
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