The beeswax transformers look like they are globbed with beeswax.
The epoxy transformers either have a clear to slightly brown milky
varnish over the wires and tape, or are molded in brown epoxy.
Yours sounds like the epoxy varnish sort, but your tests are a good
sign.
Is there a manual available somewhere?
-Chuck Harris
jrseattle wrote:
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Thanks Chuck for the reply. I have posted some pictures in an album called "Tektronix 606A". The exposed cloth-like material feels hard.
The transformer does NOT get hot (at least the top). Freeze spray does nothing. Pre-warming the transformer does nothing.
What would be the best way to remove the HV feedback loop from the circuit (as a test)? I don't quite understand how U740 (LM741 OpAmp) works here. It's configured as a non-inverting amplifier with a 1.83 amplification factor. With the OpAmp removed, the circuit does NOT oscillate and the voltage at pin 3 is between 11 and 15V, dependent on R736.
