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Old 07-31-2013, 07:47 AM
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cwmoser cwmoser is offline
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Join Date: Dec 2009
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I did not want to break the circuit so I measured the resistance.
Then powered th set with a volt meter across R83 - actually out of
curiousity I think I measured ac volts, dc volts, and used my
scope to look at the signal.
Then, I = E / R

Then adjusted Hor Drive to get current under 100ma

Let the set run for say 5 minutes, power off, discharge CRT anode, and measure temp.
These old Zenith portholes weak points are that they tend to eat up Flybacks. I wonder
if part of the problem is the way the circuit is designed and the other part the design
of the orignal Flybacks.

Carl
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1950 Zenith Porthole - "Lincoln"

Last edited by cwmoser; 07-31-2013 at 07:56 AM.
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