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In Reply to: RE: Lundahl LL1620cfb posted by Stuben on December 18, 2014 at 05:08:42
I dont understand. Isnt that schematic just showing ac feedback using the speaker winding?
What I wondered recently that even stock 1620 trans has 8 seperate output windings. Why cant you just hack one of those for a proper feedback winding or 2 even.
I have a pair of softones I bought for thier feedback windings.
Follow Ups:
I didn't answer you questions about using one of the eight primary windings. I can't say with certainty but...
I would guess that unless the primaries are designed with additional inductance, you would rob the primaries of needed inductance to properly load your plates. If you haven't, check out K&K'S forum. Kevin Carter is a strong player in the audio world presently...very sharp guy who reps the Lundahl products...
How's your building experience?
Stuben
Yes, the feedback is coming from the secondary. It is another variation of CF. At the end of the day, we're trying to make a Pentode more linear using local Cathode feedback as opposed to global feedback else you can employ global feedback. I assume that is the reason you're interested in the CF windings. I can't imagine feedback that is not AC in nature.
If you run straight DC through your primaries, not happens in the secondaries. The AC element is what we're trying to amplify and reproduce accurately.
Stuben
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