[Amps] 4 x GU-81 Grounded Grid Penthodes

Máximo EA1DDO_HK1H ea1ddo at hotmail.com
Fri Mar 2 14:30:35 PST 2012


Hi all,

I´ve been told that I can use DC for filaments (instead of AC), Is that true?
If it is true, Can I use switching power supply for filaments?

Tubes GU81 needs 12.6 v and around 10A, I could use 2 x 12.6 25A switching power supply in parallel with two chokes.

Is that correct?

Is there any difference to use AC or DC for filaments?  (in grounded grid )

Thank you

73, Maximo - EA1DDO
 		 	   		  


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