[Collins] 51S-1 Audio

[Dr. Gerald N. Johnson]

On Wed, 2006-10-04 at 16:15 -0400, Peter E. McGovern wrote:
> After having carefully warmed this old rig up (very slowly) on the veractor

VARIAC... varactor is a varible capacitance diode.

> everything seems to be working perfectly.  Nevertheless, USB/LSB/CW sounds a
> bit garbled (maybe 60 cycle).  Voice sounds gravely and CW kind of buzzy.
> Before I start poking around, anyone have any idea(s) about where to start?
> 
> Pete
> KE4PPI
> 
Could easily be the electrolytic filter capacitors are leaking and have
high series resistance after being ignored for years and are letting
there be lots of ripple on the supply lines.

Could be some heater to cathode leakage in most any stage, more
troublesome in oscillators.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer