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Original Message
for what it's worth ...
Posted by mikeyb on November 17, 2010 at 11:54:28:
The 'Miller' capacitance of a 2A3 is higher than that of a 300B - 93 pF versus 82 pF. That of a 45 is lower - 36 pF.
So if I were to choose a 2A3 driver for a 300B, the 'predriver' would see a more capactive load that if it were to drive the 300B directly. Cause for thought.