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In Reply to: RE: Magnavox Rebuilds and Fultons (longish) posted by JJ Triode on April 05, 2014 at 14:48:08
Lets make your next P-P amp even simpler. Two stage, direct coupled, differential front end.On my "master" schematic, eliminate C-12, R-9, C11 and short-out R-8.
On supply, L1 and L2 is 21 Ohms or less, under two pounds. C1 is 20 uF and C2 is 50 uF.
V2 is a 12AX7 at 1 mA. of current, each section, and over 150 VDC Ea.
I heard this in a small room, with 6AH4GT Finals, and it floored me on FMI-80s.
Jeff Medwin
Edits: 04/05/14 04/06/14Follow Ups:
Thank you for posting the schematic Jeff.
The funds aren't available at the moment to embark on another amp build.
I would like to perfect what I have built though.
Any thoughts or suggestions would be welcome.
This is the schematic that I followed...
For what it is, thats not too bad. You can't start to mess with it too much, Its sort of a proven balanced design. Leave it alone.
Some of the things I don't care for is the paraphrase ( out of time, after the fact ) phase splitter, the series cap-couple to the grids of the finals, the need for negative feedback loop, and the extra parts.
My suggestion is simpler, cleaner, on-time, zero feedback loop. My suggestion is less power, but more music. Substitute inexpensive 6AQ5s for 6BQ5s in my suggestion, and a 12AX7 front end tube. BUT, you would need a higher VAC power transformer, to get higher voltages. A whole new amp. Enjoy yours. I think you should be fine with what you have.
Jeff Medwin
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