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Old 8th Feb 2012, 7:19 pm   #2
Heatercathodeshort
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Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
Default Re: Pye VT2 EHT problems

The H.T. quoted is 174v so your 168 is about spot on. I doubt if the LOPT is faulty as the EY51 is attempting to heat with very little AC on it's anode.
If you are sure you have replaced the caps in the line output stage, check they are fitted on the correct tags. C52 the boost cap and C51 cathode bypass decoupler to the PL81 and the H.T. decoupler, C67 12uf [10uf]. The PL81 may be low emission but is such a simple circuit that not much can go wrong. The LOPT is possible but I have a big doubt about that. The line oscillator transformer may have very low Q or partially O/C. Worth checking the resistance values. It has been known for them to continue working of a fashion when virtually O/C. Not a bad start to be honest. I'm sure you will get there. Regards, John.
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