[AMPS] 811A Plate Impedance?

[Michael Tope]

I am in the process of adjusting the PI Network (inductor taps) on 
this old 4 x 811A amp that I inherited and was wondering what 
impedance I should terminate the PI network with when making my 
adjustments? Per Orr's Radio Handbook, the plate Z of a single 811 
at 1700V is 5200 Ohms. I am running around 1600 Volts across 4  
811As. For my initial adjustments, I used a 1500 Ohms carbon resistor 
across the tuning cap. Is this close enough? Should I include some
additional shunt C to simulate the tube capacitance?

Thanks,

Mike, W4EF.....................................


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