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14th Apr 2021, 12:07 pm
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#1 |
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Nonode
Join Date: Dec 2012
Location: Bocking, near Braintree, Essex, UK.
Posts: 2,071
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Pye P76F
Hi folks
picked up a Pye P76F from a local second hand shop, and after checking the set over I discovered that one half of the output transformer is open circuit. I have put a thread on the wanted section and galloway ( Brian) has responded to this. The cabinet is in fine state. When I get the transformer I can progress the work on the rest of it. More to follow. Ken |
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19th Apr 2021, 9:57 pm
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#2 |
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Hexode
Join Date: Feb 2008
Location: Wrexham, North Wales, UK.
Posts: 466
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Re: Pye P76F
Before you fire it up with a replacement o/p transformer, for goodness' sake check the coupling cap to the output stage (C35 on the manufacturer's sheet), or you may lose the new transformer very quickly.
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20th Apr 2021, 12:51 pm
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#3 |
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Nonode
Join Date: Dec 2012
Location: Bocking, near Braintree, Essex, UK.
Posts: 2,071
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Re: Pye P76F
Yes did this anyway as part of my standard proceedure, the replacement o/p transformer is in and the only valve I had to replace was the ECH42 and the mains lead. It is a lovely sounding set now.
Ken |
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20th Apr 2021, 6:57 pm
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#4 | |
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Pentode
Join Date: Dec 2009
Location: Chatteris, Cambridgeshire, UK.
Posts: 176
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Re: Pye P76F
Quote:
It is not until the output transformer fails due to excess current via the primary that anything wrong is noticed. I would advise checking the voltage conditions of said valve (against the service data) to ensure conditions are remaining within limits, especially after a short period of operation when the set has reached operating temperature.
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Andrew |
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