DX 40 Help

[K4KGW]

Coupling caps in audio section?  Any electrolytic cathode bypass caps in
the rig?

Keith

Charles Leidner wrote:

> I just acquired an extremely clean DX 40 and have a problem I need
> help with,It is a slight AC hum on phone only. Power supply checks out
> ok. CW carrier is very clean (no ac). Replaced 12AX7 and 6DE7.
> Tightened all ground lugs. Replaced cer. caps to ground in audio
> stage. Checked xtal vs VFO. Changed paper caps in audio stage.
> Disconnected mike.    All to no avail.Any Ideas ?  Thanks, Charles
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