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Biasing a Threshold

Ok,I've read that one can adjust bias on a solid state amp.
I have also read a fellow sent his Threshold into 'Threshold Restoration' and they corrected the bias which in turn,made his amp sound much better.
I don't want to contact Threshold
1) Im sure they will tell me not to do it or even give me instructions.
2) I dont want to pack and ship this amp.

I have a S/300 A/B Stasis with optical bias.
I know how to bias tube amps.
If any one can offer me detailed,step by step instructions,including the proper bias and/or a better bias setting I would be thankful.
dave
david99

Showing 1 response by oldears

oldears
386 posts
 
The bias procedure on a Threshold amp is a little special.
As I remember it involved removing a screw near a heat sink and inserting an accurate thermometer, letting the amp cook until it is stable and setting the bias for a given temperature. It then has to cook again to recheck.
You should check with the Threshold restoration group to be sure. If the amp has never been updated it is probably time to replace the power electrolytic caps anyway and this may make a bigger difference than readjusting the bias.
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