[Drake] Transmit audio problems

[Dan W. Dooley]

I had a few comments on the audio from my T-4XB recently.  They said that,
although it did not sound "bad", there appeared to be something of a slight
buzz or perhaps raspyness to it.  Not really a distortion as such.  The
suggestion has been that it's in the audio stages and not anything directly
RF related.  Perhaps an audio tube or capacitor.

I'm using a D-104 mic.  Same one I've used for years.  I have replaced some
capacitors in the rig.  Some disks and some of the tubular ones.  The .47
mfd ones, for example.  Guess I can't vouch for the quality of the later
ones.  I've also replaced all of the electrolytic caps in the AC-4 supply
and the two electrolytics within the transmitter itself.  This rig has also
had the PA converted to 6146 tubes.  I also have installed the fan mod.
That is a small DC fan on the back of the PA cage powered by a small
half-wave rectifier circuit "stealing" power from the filament supply.

Any ideas?

Dan W. Dooley  WB5TKA  Bedford, Texas
   e-mail to: dandooley@pipeline.com
   Web address: http://www.qsl.net/wb9tka
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