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Automatic Bias Control sliding bias

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litefoot22

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Joined 2011
Automatic Bias Control or sliding bias. There is a rather interesting article on the Brooks Amplifier in one of the audio magazines this month. I was quite intrigued in the idea. The idea is rather simple, a Push Pull is biased for class A. As the signal increases above 5 watts output, The bias Ckt increases the bias and slides the tubes into class AB1. Higher output the tubes slide into class AB2. The Brooks amp is from 1947 and a bit dated has anyone experimented with the Ckt. Any input would be welcome. George
 
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