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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: good push pull 2A3 design schematic posted by vinnie2 on September 17, 2017 at 07:33:22:
I would look at starting with something like the Mullard 20W amp as a starting point.
You'll need to lower the B+ a little bit for the 2A3, and I'd assume that you'll run cathode bias instead of fixed bias.
Substitute a 12AU7 or 6CG7 for the 12AX7 (you don't need the gain), adjust the biasing in that stage to account for the tube change. With lower available B+, the AU7/CG7 will be plenty happy with a lower impedance pair of plate resistors.
Lastly, remove the compensation on the driver plate load and disconnect the feedback.
Gain is likely a little higher still than you'd want, and perhaps using half of another 6CG7 instead of the EF86 will give you a driver stage that isn't overly sensitive.
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Follow Ups
- RE: good push pull 2A3 design schematic - Caucasian Blackplate 11:31:47 09/17/17 (2)
- RE: good push pull 2A3 design schematic - vinnie2 12:42:42 09/17/17 (1)
- RE: good push pull 2A3 design schematic - Caucasian Blackplate 07:19:11 09/18/17 (0)
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