Re: Output transformer - when needs must
What is the output valve, triode or beam tetrode/pentode?
For beam tetrodes or pentodes, the optimum load is approx. 0.9 x Va / Ia where Va is the steady-state anode - cathode voltage (don't forget to allow for cathode bias resistor drop) and Ia is steady state anode current. Triodes are a bit more complex because generally the input signal has to be larger and you are constrained by not taking the grid positive.
For a mains output pentode, yes I agree 17k does sound high.
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