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How much power do Vacuum tubes need to function and will they run off of DC current?

 

Dr.Bill7 years ago
If you run tube filiments off DC the filiment life will deteriorate due to filimemt streatching.
Halacrafters made a radio that ran on 67.5 VDC and 110 VAC.
 if you are really in to that ancient tech ,  www.lindsaybks.com has a lot of manuals .  old and new on th' suject ,  including one that tells you how to make yer own and design them for a specific purpose !