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Nickthedentist · 4th May 2012, 2:42 pm

ISTR these use negative feedback from the secondary of the OP transformer.

Maybe you've got yourself postive feedback? Try reversing the polarity of the connections to the secondary and see what happens.

Nick.

4th May 2012, 2:42 pm	#19
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,846	Re: Pye Black Box ISTR these use negative feedback from the secondary of the OP transformer. Maybe you've got yourself postive feedback? Try reversing the polarity of the connections to the secondary and see what happens. Nick.