6DJ8 cathode heater voltage question.

[fdegrove]

Hi,

In which case you would have a full wave rectifier but not a bridge.
Don't forget the 6X4 has common cathodes.

Cheers,

[Sch3mat1c]

30mA? Heck, use a few 6AL5s. Lesse, one diode can handle 9mADC, so 3 in parallel per leg should work out fine. That makes 12 diodes total, which is 6 tubes...dime a dozen for sure, but if you didn't get smart with arranging them on the chassis you could take up a *lot* of space...
Hmm. I can't think of any diode for 30mA that's smaller than a 6X4...oh well

OTOH, to play Devil's Advocate, why not all SS?

Tim

[Morse]

Hi fdegrove;

>>...In which case you would have a full wave rectifier but not a bridge....<<

Not sure I follow you. Okay, if I wire both anodes of the 1N4007's together at ground, the cathode of the 6X4 to the B+, and then each junction of a 1N4007 cathode to a 6X4 anode to different legs of the HT secondary (leaving the CT of the HV secondary floating free) then don't I have a full wave bridge? I just drew it out in schematic and it looks okay over here.....

Hi Tim;

6AL5's? I only have one or two of those in my 'lesser used valves' bin. Hmmmm, I'd originally planned an all SS rectifier, but I've got some 6X4's laying around so what the heck..... ;-) Since I'm redoing all my layouts, maybe I'll switch back to all SS since then I've got the parts on hand - no need for new sockets or the need to hand make some extra fittings to mount valve rectifiers.

Thanks guys and all the best,
Morse

[fdegrove]

Hi,

Not sure I follow you.

Probably it was me not following you,I was convinced you wanted to get rid of all the silicon stuff.

The way you describe it you will have the added advantage of a slow start for your circuit + a simulated CT.

Cheers,