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Sideband · 12th Jan 2021, 10:09 pm

The PC92 is an RF amplifier of very low power. Either a very serious fault developed with the heater chain shoving mains through it or perhaps the aerial was struck by lightning. I can't think of any normal situation where a low power RF amp would be destroyed in such a way. I'm thinking that it was probably in grounded grid mode so the aerial input would have been to the cathode.

12th Jan 2021, 10:09 pm	#2
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,580	Re: Serious valve failure !! The PC92 is an RF amplifier of very low power. Either a very serious fault developed with the heater chain shoving mains through it or perhaps the aerial was struck by lightning. I can't think of any normal situation where a low power RF amp would be destroyed in such a way. I'm thinking that it was probably in grounded grid mode so the aerial input would have been to the cathode. __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....