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In Reply to: Re: message for Eli posted by Eli Duttman on April 20, 2007 at 16:42:23:
Ok, I think I finally understand. I take it I hook one leg of the rectifier windings to each of the 6Au4's. Can I use the same filament supply for both of them? Should it be a dedicated filament supply for just them?
Thanks
Vince
Follow Ups:
A separate filament trafo that floats is a very good idea. Wire the heaters either in parallel or in series. There are pros and cons to both arrangements.Look at the 6AU4 data sheet. Notice that the cathode is isolated from the heater. This is the usual state of affairs with damper diodes. Connect the 2 cathodes to each other and take the "raw" B+ from the junction.
Eli D.
Seems like there is always another question... do the N4007's go in the same direction to the cathodes as they do to the plates in the schem.?
Thanks
Vince,You wire a set of UF4007s cathode tied to anode. The free anode of a set goes to ground and the free cathode connects to the rectifier winding.
NEVER use 1N4nnn diodes, as they are NOISY. UF4nnn parts are MUCH quieter and they are not expensive.
Eli D.
nt
Yes, in this case the two can share a filament winding. Run the two in parallel. If your winding has a CT use it for the output to the first cap, if not use pin 8.BTW on the pic the first cap is 100uf. That strikes me as a bit large. I’d use 40uf …John
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