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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: Build ideas for Allen Wright PP-1C Push Pull Power Amp posted by Burney on April 15, 2007 at 06:39:37:
A couple of quick points.
1) Those 330K Ohm Rg1 resistors on the output tube grids is something you'd need to watch. They may need to be lowered in order to use other tubes (cetainly would have to be lower for 6550). If you try to go fixed bias then they are even too high for EL34 (Max Rg1 values are always x 2 or x 2.5 lower for fixed bias than for cathode bias). I suggest you stay away from fixed bias in this case.
2) Gain can easily be adjusted. The gain of this circuit is set by those 470 Ohm resistors in the diffamp cathodes. Lower resistance means less degeneration of gm which in turn means higher gain. (gain of a cascode is approximately equal to the gm of the lower tube x RL at the top tube anode).
Cheers,
Ian
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Follow Ups
- Re: Build ideas for Allen Wright PP-1C Push Pull Power Amp - Gingertube 16:54:32 04/15/07 (3)
- Re: Build ideas for Allen Wright PP-1C Push Pull Power Amp - Burney 23:51:18 04/15/07 (2)
- Re: Build ideas for Allen Wright PP-1C Push Pull Power Amp - Burney 02:44:42 04/17/07 (0)
- Re: Build ideas for Allen Wright PP-1C Push Pull Power Amp - Gingertube 00:38:32 04/17/07 (0)
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