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Ed_Dinning · 19th Sep 2020, 7:31 pm

Hi, as the heater power requirements for the valves are similar it would be easy to wind a 4v to 6.3v autotransformer for this set as no isolation would be needed in this position. It would be quite small and easily hidden.

I have produced these in the past to "shift" the CRT heater voltages when different voltage tubes were used

Ed

19th Sep 2020, 7:31 pm	#12
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: PX4 substitutions Hi, as the heater power requirements for the valves are similar it would be easy to wind a 4v to 6.3v autotransformer for this set as no isolation would be needed in this position. It would be quite small and easily hidden. I have produced these in the past to "shift" the CRT heater voltages when different voltage tubes were used Ed