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I really do not like going belwo 34mA much less 28mA. My E元4 at around 460VDC stay around 38-41mA. The amplifiier looses some detail and bottom frequencies do not sit right. Still I cannot stand to go too close to crossover region. But too cold and the bias point is too low putting out less power and causing the user to up the volumes for more signal which in turn makes the signal dirtier. The bias is colder and the B+ goes up a little giving the power tubes more headroom. The thing is the power tubes are now putting out more power, quicker, so you end up lowering preamp signals and turning down the overall volume which in turn keeps the signal cleaner.Ī colder bias gives more headroom but when bias point is too low the operation gets into crossover distortion. A hotter bias drops the B+ a little and places the incoming signal closer to that level which actually decreases headroom of the power tubes. It just provides a clearer more detailed signal up front.
![self bias guitar amp self bias guitar amp](https://www.amplifiedparts.com/sites/all/modules/custom/tech_corner/img/bias-amp-trimmer-styles-2.jpg)
To me that is to close or into crossover distortion for those amplifiers.Ī hotter bias does not give more headroom. So do you like the cold biases at 26 and 28 per tube? You like crossover distortion?
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