In Reply to: RE: Pentode Driver Comparison 6C6, EF37, 717A, etc. posted by lovetube on February 14, 2009 at 18:39:31:
The 300B may have about a third more voltage drive requrement (to get close to max output) than a 2A3, however the current requirements are about the same. I did not think it was difficult to get decent gain, and therefore voltage swing, out of pentodes; current is the challenge. I don't believe a pentode is any more appropriate for driving a 2A3 than 300B or that for this topology a 2A3 is more suited to 2-stage. I feel that pentodes are probably better for driving the 45, which has significantly lower requirements for driver current than 2A3, 300B, PX4, or PX25.Again, it is ages since I have looked at the technicalities of driving DHTs, so could be way off.
Cheers
Edits: monor clarification of points.
Edits: 02/15/09 02/15/09
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Follow Ups
- RE: Pentode Driver Comparison 6C6, EF37, 717A, etc. - RC Daniel 14:25:07 02/15/09 (1)
- CV1043/VR53/EF39 - coresta 14:12:18 02/16/09 (0)