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Old 19th Sep 2020, 10:05 am   #9
barrymagrec
Octode
 
Join Date: Dec 2017
Location: Morden, Surrey, UK.
Posts: 1,552
Default Re: PX4 substitutions

In the original Williamson amplifier book there was a version for PX4s as well as the more familiar KT66 version.

They were to all intents and purposes identical. I changed my PX4 version to the KT66 type after an unfortunate accident involving a leaky garage roof and the mains transformer, the replacement had no 4 volt windings.
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