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October |
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Page 16 |
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Copyright © 2003 John Broskie All Rights Reserved |
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Circuits A, B, Capacitor, D, E, and F all share the same maximum power output, given the same number of triodes and B+ voltages and load resistance, which can be roughly figured out with following formulas: Imax = B+/(rp + Rload) Vmax = Imax x Rload W = (Imax x Vmax)/2 |
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The roughness enters the calculations from the varying plate resistance of the triode, particularly a triode like the 6AS7. (Only the mu, the amplification factor, is fairly constant.) Thus the best plan is to determine the triode’s rp on the 0-grid-voltage plate line only, as the previous formulas assume a grid voltage of zero. |
