PCB - Marshall, Valve PCB TSL100 / TSL122, Rev 20

My amp sounds better than ever with this board. No bias drift so you can gig worry free. It was relatively easy to install, just number every connection with masking tape and connect it back and you will have a new amp. I'm very pleased, there is no ground, no strange noises as before, just sound heaven.The price of the new board is the same as a tech will bill for the bias drift mod.You will not be disappointed.

This circuit board is worth every penny. It cured my amp of unstable runaway bias, strange noises, pops and exploding electrolytic filter caps. I could have fixed the old board, but I decided to get this because it is quite an upgrade compared to the late '90s boards...the resistors are metal film now and actually the CORRECT value (a nice surprise), and the board itself is made of a much more sturdy material. Unfortunately it still uses 2 cents a dozen capacitors. Way to go Marshall. ANYWAY when I fired my amp up after installing this, I could easily set the bias, something I was never able to do, and the voltage is rock solid. It was all over the place before. The amp sounds FANTASTIC and the buzzzzzzzz, funny noises, popping and runaway bias are gone. Marshall should be ashamed of themselves for the sub standard GARBAGE they originally put in this amp.