Pete Millett's 829B amp -> monoblocks

lochness · 16th June 2008, 11:38 PM

I'm not 100% sure about what is going on in this amp. Still I want to build it except in a monoblock version (with a different power supply...I've fallen in love with 3b28's).
What is really throwing me for a loop is the 0A3. I've never really used gas discharge tubes and I don't know what it is doing. If I did a monoblock version would each amp need its own 0A3 in the same spot?

SY · 17th June 2008, 12:06 AM

The 0A3 regulates the screen voltage for the input tube. Yes, you'll need one for each amp.

lochness · 17th June 2008, 12:12 AM

Ok so I basically have to cut the schematic in half and provide each side with its own power supply (and make sure each side has the 0A3 used in the same way as the original schematic)?

SY · 17th June 2008, 12:30 AM

Yes. R15 will also have to be duplicated.

16th June 2008, 11:38 PM	#1
lochness diyAudio Member Join Date: Dec 2006	Pete Millett's 829B amp -> monoblocks I'm not 100% sure about what is going on in this amp. Still I want to build it except in a monoblock version (with a different power supply...I've fallen in love with 3b28's). What is really throwing me for a loop is the 0A3. I've never really used gas discharge tubes and I don't know what it is doing. If I did a monoblock version would each amp need its own 0A3 in the same spot?

17th June 2008, 12:06 AM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	The 0A3 regulates the screen voltage for the input tube. Yes, you'll need one for each amp. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

17th June 2008, 12:30 AM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Yes. R15 will also have to be duplicated. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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17th June 2008, 12:12 AM	#3
lochness diyAudio Member Join Date: Dec 2006	Ok so I basically have to cut the schematic in half and provide each side with its own power supply (and make sure each side has the 0A3 used in the same way as the original schematic)?

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