[AMRadio] Audio Driver Transformer advice

b.gaz at comcast.net b.gaz at comcast.net
Mon Dec 29 20:20:40 EST 2014

Any push pull audio output transformer will work. 
5000 ohms center tapped to 10,000 ohms will likely work fine. 
It would be better to get some extra power rating, like 35 watts. 
Hammond makes them, UTC used to make good ones (LS series), etc. 


----- Original Message -----

From: "Paul Baldock" <paul at paulbaldock.com> 
To: amradio at mailman.qth.net 
Sent: Monday, December 29, 2014 6:59:34 PM 
Subject: [AMRadio] Audio Driver Transformer advice 

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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