![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfN4xMTIAne-GZfT9t_1cUMFgClG4NcKlSgK59BmvmGja6NbvmauITR7zo1hQsri-MM9QQixzOz5uCNIVnzmc8dEo8h6DpuzgObG1iNiPyIDlmBGswGzn8sAx9WZxpEqKSMQPEzSouhnZP/s320/bias_mod_unknown_origin.jpg)
A bit of a test post really - trying out the photo upload.
This is the inside of a Ampeg V4B that had burned out the screen resistors. The pic shows a mod done I found in there done by a previous tech. Stock V series amps derive the bias from the B+ supply. The transformer next to the power tubes was added across the heater supply to kludge an independent bias supply winding in the power supply.
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