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Well, Good. A dead ocs. is better than one that only works partly. Ok, No Scope, Go find
an amplifier, make probes, couple the input of the amp through a cap. to protect it.
Horiz Osc. is 15khz, take your amp and put it on the Horiz Osc. of a tube tv that works, See
if it delivers sound, and does not kill the osc. Then you can see if your tv from hell has
any osc. action at all. You might have to use a coupling cap, and big resistor, 50K?
so as not to load the test circuit with the amp input. Be aware of that...
Also Remove the plate caps from the H. Output tubes and focus on fixing the osc. And
only focus on fixing the osc. Now that I think about it, you should forget about the tuner,
and other stuff, and focus on fixing the Osc. Use Voltage checks, on the Osc. tube & the
AFC. tube. Use the amp to see if you can hear the osc. Test the sound against another
tube tv, if it sounds faster, or slower, etc.
When the osc. is dead, what happens to the -45V on G1's of the H. Output tube?
Also with this tv working some time, and not others, working in the cabinet, and then not
have you thought there might be some intermittent bad connection? Have you tried
whapping the chassis really good a bunch while it's on to see if symptoms change??
I mean whapping it like Onslow from Keeping Up Appearances......
Anything less is not considered a whap.....
.
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Last edited by Username1; 09-18-2022 at 09:34 PM.
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