Quote:
Originally Posted by ChrisW6ATV
Eric-
I first learned (the hard way!) what a "hot chassis" is when I was installing a little kit "frequency counter calibrator" into my Sony KV-1922, in 1980. I started to hook an oscilloscope probe's ground clip to the chassis when I got the big BANG! and the TV went dead. On mine, one or more of the main diodes after the power switch had blown.
I hope you can find a good deal on an isolation transformer if you do not already have one.
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Hi Chris, I do have one, I haven't been using it much lately because of the voltage drop it causes, probably not an issue with the little Sony being as it doesn't have 30 tubes, also I have the Variac now that will compensate.
Too late now, I really wasn't thinking the Sony was a hot chassis, should have guessed by the shock I got while touching the bench and the set but I guess I thought I was touching a terminal and not the chassis.
This set has a lot of Top Hat Diodes, do they usually fail open? It's not blowing any fuses or smoking so I don't think anything is shorted but the B+ seems to be dead.
Now that I have a "nice" (cough) new Meter I can do some more testing. (See the test equipment forum for more on my new meter
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