INSIDE THE MB450H

[DAGGY11]

I recently was inside my amp head changing out the preamp valve and noticed that their is and adjusting knob on the left side (if your looking at it from the front)inside of the amp. does anyone know what this adjusts?

[teemuk]

Pics would help a lot but it could be, for example, a bias trimmer. Is it close to the section that houses the power amp circuitry?

[B-string]

That is "if you touch it your taking a trip to a tech" control

[DAGGY11]

Thanks,yeah, i didn't touch it, that must be what it is,I was just curious.

[B-string]

Originally Posted by DAGGY11

Thanks,yeah, i didn't touch it, that must be what it is,I was just curious.

Just having some fun, it could be bias, could be pre-gain. Either way they can be real touchy at times and moving the slightest can send the amp into the shop.

[DAGGY11]

I HOPE THESE PICS COME OUT, BUT IT IS THE WHITE PLASTIC ADJUSTMENT KNOB. DOES THIS GIVE YOU AND IDEA?

[B-string]

Sorry link is broken.

[DAGGY11]

HERES ANOTHER PICTURE IF THE OTHERS DIDN'T COME OUT.

[B-string]

They show now, as it is on the power amp board, the good bet is it is a bias adjustment (still don't move it at all ). Sorry had to stress the point
It is also BR1 it appears?

[DAGGY11]

RIGHT ON, THANK YOU! tHE CURIOSITY WAS KILLING ME!

[B-string]

No Problem, and check the caps lock on your keyboard