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RE: Pentode Driver Comparison 6C6, EF37, 717A, etc.

Posted by RC Daniel (A) on February 15, 2009 at 14:25:07

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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