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Old 16th Mar 2018, 11:44 am   #49
Station X
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Location: Ipswich, Suffolk, IP4, UK.
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Default Re: Bush VHF 81 Restoration

it would be very unusual for wire wound resistors to go high in value.

I suggest disconnecting the wire running from C54 to the output transformer at some point. This will leave the reservoir capacitor C54 in circuit whilst isolating the PSU from the rest of the circuit.

Then check the AC voltage at UY85 pin 9 and the DC voltage at UY85 pin 3. If the HT is OK check that it remains OK over say 15 minutes.
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