Thanks Don. I used a 100 uf capacitor at 160 vdc, so it should be
sufficient. I hooked it up exactly as you stated, positive to ground
and the negative lead toward the center tap of the HV transformer. I
wish I could say it stopped it, but I still have problems. It did stop
a lot of the talk back, but the feed back is still there albeit not
nearly as prevalent since I switched the 2A3 driver tubes. I made a
couple of modifications to the dynamic microphone input to better
accommodate the non amplified D-104, but I can't see how that would have
anything to do with it. I can move the mic several feet away (it has a
long cord - possibly too long) and turn the audio up enough to get 100%
modulation on the scope. The 614 has a pretty high output and it takes
little to overdrive the modulator.
Rick/K5IZ
Donald Chester wrote:
How much capacitance did you use? It should be at least 20 mfd. A
cheap electrolytic should do ok, since there is only a few volts
across it. Put it between the midtap of the plate transformer and
ground. The positive side should go to ground, and the negative side
to the transformer. In all the BC-610E's I have ever seen, that
capacitor eliminates 95% of the chatter.
Don k4kyv
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