[AMRadio] 813s push pull Triode Connected Bias question.

Paul Baldock paul at paulbaldock.com
Wed Apr 22 19:59:13 EDT 2015

I just fired up my new  Modulator, driving a 10K resistor instead of 
the PA. It works well except the efficiency is low. The HV is about 
2500V. Idle current is about 60mA (150W). Efficiency at 400W RMS 
output is 42% as calculated by plate voltage times cathode current.

Does this seem typical for this configuration?


- Paul  KW7Y

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