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Questions about tubes and gear that glows. FAQ

RE: what 2 tubes will replace a 6BM8?

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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