Bottlehead Forum

RE: Ping Paul Joppa on BR for SE math

24.18.227.0

In Reply to: RE: Ping Paul Joppa on BR for SE math posted by Jim_R on May 05, 2009 at 07:15:50

Oh - I apologize. Nobody can tell on the internet!

Plate resistance from the data sheet at the SEX operating point is about 2600 ohms. I measured 258 ohms for the transformer primary, for a total 2858 ohms. Scaled by the impedance ratio of 8/8000 that's 2.858 ohms. Add the estimated secondary resistance of 0.258 ohms to get 3.116 ohms, or very close to my usual assumption of 3 ohms. So the electrical Q goes up by 11/8 or a factor of 1.375.

Hope that's more helpful!

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RE: Ping Paul Joppa on BR for SE math - Jim_R 10:16:32 05/05/09 (0)

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