Mesa 400+ Bias Mod schematic Please, Anyone.

[CEF]

Hi folks,
Just wondering if any of you amp circuit wizards out there could lend me a hand please. I am looking for a schematic, pictures of both sides of the bias mod circuit or something that shows me how to make the bias mod circuit for my mesa 400+. Everything else is in place to do the job just need the information about the circuit. Any help gratefully received.

Peace,

CEF.

[BassmanPaul]

IMO if you cannot work this out yourself you are not ready to work inside a tube amp. The circuit modification is basically electronics 101 stuff. I am concerned for your safety.

[RickenBoogie]

+1 and I'll add, I've made a living designing circuits and wiring gizmo's and what-nots, and would NOT attempt to work on my amps. It's a whole 'nother field of expertise, best left to those who know what they're doing.

[CEF]

Thank you gentlemen for your concern.
I have been a professional guitar tech for the past ten years and have modded and messed around with fx pedals for almost the same amount of time so I know that an amp is out of my league.
The guy who will do the work for me can design me a bias circuit for said mesa head but also told me if I wanted to keep costs down, (as I am short on doe), I needed to do the donkey work to find a circuit that is already in use and he'll take it from there.

[B-string]

This may help I have joined the Dark Side (well not really) check post 63.