Can you DC couple two DHT stages?

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

195.93.21.66

I'm wondering about using DC coupling for the first two stages of an amp using DHTs. This would be balanced push pull - two diff pairs, the first with a CCS in the tail. Can the second stage be done DC coupled with DHTs?
I thought about a simple experiment using 3a5s into 1J6s - both common cathode double DHTs, but it's not so simple since the 1J6 has a max anode voltage of 135v (a lot of small DHTs have low max anode voltages). If it's DC coupled, the cathode/filaments would be raised, so does this make it easier or harder to configure?
Might need to go into a transformer. Or could it be done with an anode load CCS and a resistor in the tail? I could use a pair of DHTs with a higher max anode voltage of course. Couple more sockets.
Haven't constructed this type of circuit yet with DHTs - any ideas how to make it work? Any schematics to refer to? - thanks, Andy

This post is made possible by the generous support of people like you and our sponsors:

Signature Sound

[ Signature Sound Lounge ]

Topic - Can you DC couple two DHT stages? - andy evans 03:54:43 04/10/07 (7)

The Lofton-White amp is two DHT direct coupled. - richardl 10:18:10 04/10/07 (1)

I thought the Loftin-White was SE coupled to the output - andy evans 13:40:00 04/10/07 (0)

Re: Can you DC couple two DHT stages? - Eli Duttman 06:36:39 04/10/07 (4)

Re: Can you DC couple two DHT stages? - andy evans 06:56:48 04/10/07 (3)

Re: Can you DC couple two DHT stages? - Eli Duttman 07:34:44 04/10/07 (2)

Re: Can you DC couple two DHT stages? - andy evans 07:46:05 04/10/07 (1)

Re: Can you DC couple two DHT stages? - Ray Moth 07:10:11 04/13/07 (0)

You can not post to an archived thread.