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In Reply to: RE: what 2 tubes will replace a 6BM8? posted by DAK on December 12, 2015 at 21:43:12:
If you abandon the triode option, you can run the amp without the second stage and just half a 12AX7 driving each 6550. If you want to do both, use half a 12AT7.
The choke driver would be great for pushing into A2, but I don't believe you'll have enough room on the high side of the load line to justify the trouble.
If you are insistent about the directly coupled follower drive, use an 811, remove the choke, remove the regulator at the output, and make the 22K power supply resistor ~7K.
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Follow Ups
- RE: what 2 tubes will replace a 6BM8? - Caucasian Blackplate 10:31:22 12/13/15 (14)
- RE: I checked the 6550a graphs again.... - DAK 16:31:30 12/14/15 (0)
- RE: what 2 tubes will replace a 6BM8? - DAK 12:06:42 12/13/15 (12)
- RE: what 2 tubes will replace a 6BM8? - Caucasian Blackplate 13:25:41 12/13/15 (11)
- RE: what 2 tubes will replace a 6BM8? - DAK 15:41:48 12/13/15 (10)
- RE: what 2 tubes will replace a 6BM8? - Caucasian Blackplate 15:53:44 12/13/15 (9)
- RE:I checked the tube characteristics of the 6550A... - DAK 16:14:36 12/13/15 (8)
- RE:I checked the tube characteristics of the 6550A... - Caucasian Blackplate 09:48:49 12/14/15 (7)
- RE:I checked the tube characteristics of the 6550A... - DAK 10:15:48 12/14/15 (6)
- RE:I checked the tube characteristics of the 6550A... - Caucasian Blackplate 16:55:57 12/14/15 (5)
- RE:I checked the tube characteristics of the 6550A... - DAK 17:41:00 12/14/15 (4)
- RE:I checked the tube characteristics of the 6550A... - Caucasian Blackplate 09:49:30 12/15/15 (3)
- RE: Ok, that makes sense. Now to improve.... - DAK 10:41:10 12/15/15 (2)
- RE: Ok, that makes sense. Now to improve.... - Caucasian Blackplate 10:45:12 12/15/15 (1)
- RE: I have no 2A3... - DAK 12:18:12 12/15/15 (0)