Seeing as how it could be a long winter and I have finished my 26/26/45 amp, I am considering taking another stab at actually trying to design one. I have Bruce's book and Morgan's book and posts saved from the kind souls here who have tried to help me get my head around this stuff, but I have yet to be able to bring it all together.
This time I want to bread board a simple two stage dht SET using the 71A as an output tube. Using the above mentioned resources, I have come up with the following operating points for the 71a.
plate volts 180 vdc, plate current 20 mA, and grid volts -40 vdc.
That part was pretty easy, but now I have run aground on how to choose a driver tube. The explanations I have read so far are quite complex, and I am wondering if anyone knows of one that is simple and straight forward?
I was thinking a 6SL7 in srpp might work as I have a schem of a SET 45 amp that did used that, and I built the "Bugle" some years ago and liked the sound of it. It used 6SL7's in srpp mode as drivers.
Or maybe I could use two 26's like I did with the 45 amp? I do like the sound of the all dht amps. I would really like to learn how to determine which of these, if any, will work properly.
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Topic - here we go again....... - vinnie2 06:15:35 08/19/16 (34)
- Bugle used 6072A - Gordon Rankin 12:11:25 08/19/16 (8)
- The 6072 is a 12AY7 and is a true audio tube. - Michael Samra 21:52:09 08/19/16 (6)
- 6072A is a most excellent tube - FenderLover 07:23:59 08/20/16 (5)
- RE: 6072A is a most excellent tube - Michael Samra 16:46:33 08/20/16 (4)
- guess I should give them a try ......(nt) - vinnie2 18:08:40 08/20/16 (3)
- I have been using them in guitar amps, not a fan of 12AX7's - Gordon Rankin 07:06:45 08/22/16 (1)
- Blackface Bandmaster amp - FenderLover 09:15:58 08/23/16 (0)
- RE: guess I should give them a try ......(nt) - Michael Samra 22:09:21 08/20/16 (0)
- RE: Bugle used 6072A - vinnie2 12:19:58 08/19/16 (0)
- RE: here we go again....... - drlowmu 09:56:00 08/19/16 (16)
- RE: here we go again....... - vinnie2 11:51:51 08/19/16 (0)
- RE: here we go again....... - Palustris 11:33:16 08/19/16 (14)
- RE: here we go again....... - drlowmu 08:29:23 08/20/16 (3)
- RE: here we go again....... - Palustris 13:07:48 08/20/16 (1)
- Wonderful ( nt ) - drlowmu 13:28:49 08/20/16 (0)
- RE: here we go again....... - vinnie2 08:55:27 08/20/16 (0)
- RE: here we go again....... - sonicboom 12:24:11 08/19/16 (4)
- RE: here we go again....... - Palustris 12:58:27 08/19/16 (1)
- RE: here we go again....... - sonicboom 13:54:43 08/19/16 (0)
- RE: here we go again....... - vinnie2 12:36:51 08/19/16 (1)
- RE: here we go again....... - sonicboom 12:55:57 08/19/16 (0)
- RE: here we go again....... - vinnie2 11:54:24 08/19/16 (4)
- RE: here we go again....... - Palustris 12:31:09 08/19/16 (3)
- RE: here we go again....... - vinnie2 12:40:16 08/19/16 (2)
- RE: here we go again....... - Palustris 13:10:47 08/19/16 (1)
- RE: here we go again....... - vinnie2 13:23:18 08/19/16 (0)
- SRPP - Triode_Kingdom 08:11:46 08/19/16 (5)
- RE: SRPP - vinnie2 12:06:26 08/19/16 (1)
- RE: SRPP - Triode_Kingdom 13:55:45 08/19/16 (0)
- RE: SRPP - Tre' 09:36:37 08/19/16 (2)
- RE: here we go again....... - hifipaul 07:09:32 08/19/16 (1)
- RE: here we go again....... - vinnie2 12:13:52 08/19/16 (0)