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Post subject: Sag and bias controls
Posted: Fri Mar 04, 2011 9:25 pm
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What do these controls do?


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Post subject: Re: Sag and bias controls
Posted: Fri Mar 04, 2011 10:02 pm
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They work similar to adjusting the bias on a tube amp.

Lemme know if this helps:

viewtopic.php?p=581659&sid=5aeea44ae4f8c5621deec6f4391eb3df#p581659


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Post subject: Re: Sag and bias controls
Posted: Sat Mar 05, 2011 6:48 pm
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Old road trick - push your bias and the amp crunches much sooner. You can get that "tubular" compression and sustain without lousing the highs in the front end - it makes overdriving the power tubes easier.
(I suspect there are college papers written on the various aspects of preamp vs power amp distortion and overdriving)
With the MUSTANG III you can run the preamp with less distortion and gain but get the poweramp to sustain for you.

Of course with a real amp you went through tubes much faster and with some, you might get pyrotechnics along with the music (British output transformers were famous for this). Some insane guitarists push 150 volts down the power line via a transformer to also get this effect.

Sag is what happens when your high voltage starts to dip. Even in new amps it can happen when run at high output - part of what makes a Champ sound like it does when run at 10.


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