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Old 6th January 2007, 05:29 AM   #21
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Over years of experimenting with economical tube power amps I come finally to the solution used, as I found, long time ago by Altec Lansing in their 1569A amp. The wheel is reinvented... You are welcome to reinvent it again!
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Old 6th January 2007, 06:37 AM   #22
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I'm sorry, I just wondered if 12AT7 might sound better than 12AU7 in that position. I would think it probably should.
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Old 6th January 2007, 11:02 AM   #23
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I have used E80CC instead of 12AU7, and 12AT7. Each time the open loop gain goes up as a result, the spare feedback over-tightens the sound. I reverted back to 12AU7. But maybe it will sound better with 12AT7 when I will use bigger woofers.
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Old 6th January 2007, 12:52 PM   #24
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Quote:
Originally posted by Wavebourn
Over years of experimenting with economical tube power amps I come finally to the solution used, as I found, long time ago by Altec Lansing in their 1569A amp. The wheel is reinvented... You are welcome to reinvent it again!
I am happy that my amp looks like a classic good scheme. Any Ideas of how can I make it perform even better? Modifications suggested?
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Old 6th January 2007, 06:32 PM   #25
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Quote:
Originally posted by salas


I am happy that my amp looks like a classic good scheme. Any Ideas of how can I make it perform even better? Modifications suggested?
Yes. A phase splitter with separate anode and cathode loads between input amp and a differential cascade for better symmetry, all directly coupled. If you go with push-pull for power economy, go to the logical end instead of stopping on half-measures. It is my suggestion. However, the result will be again classical, but you come to it going by your own way.
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Old 6th January 2007, 07:02 PM   #26
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Thanks. Do you have a link to such a classic schematic so I can study it?
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Old 6th January 2007, 07:41 PM   #27
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Quote:
Originally posted by salas
Thanks. Do you have a link to such a classic schematic so I can study it?
Try: http://www.google.com

Good luck!

Edit: I've found it for you: http://www.one-electron.com/FC_ProAudio.html
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Old 6th January 2007, 08:18 PM   #28
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Quote:
Originally posted by Wavebourn


Try: http://www.google.com

Do not advertise your secret membership of this community too much; other mortals might want to find things themselves otherwise
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Old 6th January 2007, 09:59 PM   #29
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Thanks again.
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Old 6th January 2007, 10:50 PM   #30
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Well, here's the latest schematic. Mostly plagiarized from the Williamson, but I didn't like the biasing scheme for the outputs so I substituted my own. I figure tubes should draw around 45-50mA each. My only concern was leaving out the pot between the two 220K resistors after the .47uF coupling caps - is one needed?

Click the image to open in full size.

EDIT: Once again, the OPT is the 6600-8 a-a 60W Edcor.
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