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music-centre · 8th Nov 2017, 11:08 pm

Could it possibly be the paxolin the valve holder is made of has become conductive? - I have just started looking at a GEC BC4750 that uses these types and with the X61M valve out you can see a small area of the valve holder glowing/sparking!
Steve.

8th Nov 2017, 11:08 pm	#30
music-centre Heptode Join Date: Sep 2007 Location: Brentwood, Essex, UK. Posts: 687	Re: Oh No! Not another howler. Could it possibly be the paxolin the valve holder is made of has become conductive? - I have just started looking at a GEC BC4750 that uses these types and with the X61M valve out you can see a small area of the valve holder glowing/sparking! Steve.