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In Reply to: RE: I think I fixed the problem with my Beveridge OTL DD amplifier posted by Lew on October 13, 2020 at 11:50:29
Great news. I've been wondering about this for quite a while.
Follow Ups:
I am almost afraid to have reported success, since the real proof of the pudding comes when I re-attach the amplifier to its speaker. I may have reported earlier that I built a dummy speaker load to use while doing this work. This consists only of two 3nF capacitors soldered end to end. The junction of the two capacitors goes the screen output of the amplifier, and the stators connect, respectively, to either end of the series pair. All of this is in an insulated box with 20KV wires terminated in HV banana plugs that go from inside the box to the amplifier via holes in the box. (I think I did mention it elsewhere.)
Lew-
We had a dummy load in the lab - it was a couple pieces of phenolic that on one side had the banana plugs facing down- and then sandwiched between the two phenolic boards were a set of caps and a resistor (IIRC) - i'll need to dig around next time I am at his last lab/house to check values - but your idea is Spot ON!
Happy Listening
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