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Originally Posted by Electronic M
Is the frequency and waveshape of the oscillator to spec? If either is far enough off spec it the fly could be operating off of its resonant frequency...When you operate a resonant transformer off frequency its output voltages will drop.
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The waveform looks good, and I think you're right in such a circumstance that may very well be the case. I'll need to go back and check this.
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I may be wrong but, I believe the 140V source of pin6 is the starting voltage that gets the osc to drive the flyback just enough that you get enough boost to add drag the plate supply higher which creates a positive feedback effect until the circuit reaches it's designed operating point...
If you have a spare 450V power supply it could be interesting unhooking R69 from boost and forcing normal running voltage into the osc.
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This makes sense, though I don't have a B+ supply handy to test this.
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Also please tell me you did not hack up a Halolite to stuff a BPC color set in for your avatar.
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I think it looks better than a bookshelf or an aquarium.
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Originally Posted by damen
As a test, even though it rings okay, sub a different yoke. Any yoke will do, just use the top horizontal connection at terminal number 2, and the bottom connection going to the .033 cap ( which I assume has been tried).
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Great tip. I pulled out an old Predicta yoke and subbed it in with absolutely no change... so I'm glad it's not the yoke, at least!
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Originally Posted by old_coot88
Have you verified R68 and R69 for correct values (47K and 680K respectively)? They should be checked with one end disconnected.
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I did, and these resistors are well within tolerance.