[AMRadio] Audio Driver Transformer advice

b.gaz at comcast.net b.gaz at comcast.net
Mon Dec 29 22:46:47 EST 2014

I have used various 5000 ohm center tapped to 8 ohm transformers driven by a 20 watt amp to drive 811's, 100TH's, 4x150/4cx250's and KT90's without any problems. 
That is class B, and AB1. 

To drive the grids of 813's I am sure an 8 ohm to 5000 ohm center tapped transformer will work great. 

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

From: "Paul Baldock" <paul at paulbaldock.com> 
To: "b gaz" <b.gaz at comcast.net> 
Cc: amradio at mailman.qth.net 
Sent: Monday, December 29, 2014 9:37:00 PM 
Subject: Re: [AMRadio] Audio Driver Transformer advice 

I need a turns ratio of around 10:1, which is an impedance ratio of 
100:1. For example 600 Ohms CT to 6 Ohms. I think a transformer 
designed for 5K would not work in this application. 


- Paul 

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