Quote:
Originally Posted by Niechcial,Steve
It was tempting to try the pitch removal route, but to be honest, I am limited in the time I want to spend on this machine. So I went down the hack-off the overwind road. This did not cure the slowly dropping boost problem. So pray the fault is the main windings else I made an expensive mistake. We won't know until early New Year because Mike Barker won't be able to rewind it till then. I'll keep you informed and thanks for all the help.
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Unfortunate indeed. You've probably already replaced the coupling capacitor between the line oscillator and PL36 and checked the line drive minus voltage at the control grid of the PL36 before and after the fault develops.
The screen grid feed resistor to the PL36 could also change value when hot.
If all is well I would suspect the primary. Don't be too despondent in hacking off what appeared to be a good overwind. From experience if one set of windings fail the others fail not long afterwards.
Presumably you're having the complete LOPT rewound?
Cheers
Brian