trinityamps.com

Anyone try a fixed bias conversion? What would it take and how would it sound? Is it worth a try?

I have used fixed bias in several 18 watt style amps and the Lightning isn't all that different in the basic power amp. All it takes is a pot (optional) and a few resistors and caps. You can can see a circuit in the Vajra build under DOWNLOADS/MODS on the http://www.18watt.com forum.

The difference in sound is mostly in the low end. The amp becomes tighter and has a less loose low end. The Vajra build has a switch to switch between modes.

Another place to look is at the Marshall Park and 20 watt amp scheamtics. One or two of those used a fixed bias arrangement.

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Richard Johnson
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Playing an insturment doesn't make you a musician, listening does