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Heatercathodeshort · 11th Aug 2017, 7:03 am

Great performers. The only let down is the GEC triode tube that tends to go O/C, low resistance heater and low emission. You probably have one of the good ones!
The B36 is the line and frame oscillator. It can be replaced by a 12SN7GT. I have a few spare B36's if you would like one.
The sound output valve is the little N37. John.

11th Aug 2017, 7:03 am	#4
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: And the next one! a GEC BT2147 Great performers. The only let down is the GEC triode tube that tends to go O/C, low resistance heater and low emission. You probably have one of the good ones! The B36 is the line and frame oscillator. It can be replaced by a 12SN7GT. I have a few spare B36's if you would like one. The sound output valve is the little N37. John.