TS-830S Power Supply Follies
 

Hello, All...

My Kenwood 830 has had an intermittent power loss which is now
permanent. The main symptom: even while tuning, any drive increase
will cause a rapid drop in plate voltage from 800 to around 500 volts,
with a terrible hum. I don't want to tear components out just to test
them, but a Cap. tester shows 47 mfd across one of the big 'lytics, and
around .1 mfd on the other. Just for grins, I tried the same test on
my [functioning] TS520, and got strange readings there also. (Yes, I
realize I am trying to analyse a network by not extracting the
component physically.)

The power problem is identical with other driver and final tubes.

These big 'lytic caps are now discontinued.

Sound familiar?