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PJL · 20th Feb 2018, 11:33 pm

Well spotted on the wrong valve. The 7D3 looks pretty rare, the PEN36C is a possibility. Either way you should check the LT current as the 7D3 is 40V and the PP3520 is 35V. There is some info here on the Cossor version of the 7D3: http://g3ynh.info/valves/old/Data-Bo...ossor-p090.pdf

Is it the original output transformer or has that been changed to match the triode?

20th Feb 2018, 11:33 pm	#28
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: KB 381 5 valve AC/DC superhet Well spotted on the wrong valve. The 7D3 looks pretty rare, the PEN36C is a possibility. Either way you should check the LT current as the 7D3 is 40V and the PP3520 is 35V. There is some info here on the Cossor version of the 7D3: http://g3ynh.info/valves/old/Data-Bo...ossor-p090.pdf Is it the original output transformer or has that been changed to match the triode?