[AMRadio] Audio Driver Transformer advice

Paul Baldock paul at paulbaldock.com
Mon Dec 29 18:59:34 EST 2014

I'm building a modulator with 2 x 813's in pushpull (strapped as 
triodes) driven by a 20W Solid State audio amplifier. I need a driver 
transformer to go between the 813 grids and the 20W amp. The 20W amp 
can drive about 20V peak to peak. I think I need about 200V peak to 
peak for the 813's, so a 10:1 turns ratio ratio would be about right. 
So based on that an audio transformer designed to go from 600Ohms 
center tapped to 4 or 8 ohms would probably do the job. Have I got 
the math right? Does something like this exist?



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