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RE: Losses in Output Transformers

Gordon, there's no slew rate limiting at the midrange frequencies where these measurements are being made. Pentodes don't exhibit sufficient input capacitance fro that to occur, and the empirical proof is that open loop gain and output power show no significant change with frequency until the input sweeps at least an order of magnitude higher. If you see greater output with direct coupling, it can only mean you're pushing into AB2 and drawing grid current. The charts I posted are specifically noted as being AB1 with no grid current and no driving power required.

As for FB, every amplifier I've ever built produced slightly more power (at the threshold of clipping) with feedback applied. That's due to the corrective nature of the loop.







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  • RE: Losses in Output Transformers - Triode_Kingdom 09/17/2113:45:34 09/17/21 (0)
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