Roland Spirit Bass 50

peobus

Member
2006-07-29 11:15 pm
I'm a DIY guy used to working with tube circuits. I'm new to solid state amplifiers in terms of repairs and modification.

I've inherited the aforementioned amp. While it powers up, none of the pots work. With an instrument plugged in, the amp produces enough volume that I think a preamp circuit is good. After that, it's anybody's guess. The amp includes a parametric eq section that stops all sound when the switch is engaged.

I contacted Roland about the schematic but they weren't able to produce one. Any ideas where I might begin?

peobus