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Sideband · 30th Jul 2010, 9:23 pm

If the filaments aren't lighting because of an O/C somewhere (not necessarily and O/C filament but possible a valveholder with a duff pin) then the HT will be high as well. Is there any life at all from the audio (finger on middle contact of volume control)...buzz?? What are the volts across each individual filament (pins 1 & 7)? If the filament bypass cap has over 50 volts across it, there is an O/C somewhere.

SB

30th Jul 2010, 9:23 pm	#37
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,580	Re: Bush BAC31 motorboating If the filaments aren't lighting because of an O/C somewhere (not necessarily and O/C filament but possible a valveholder with a duff pin) then the HT will be high as well. Is there any life at all from the audio (finger on middle contact of volume control)...buzz?? What are the volts across each individual filament (pins 1 & 7)? If the filament bypass cap has over 50 volts across it, there is an O/C somewhere. SB __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....