Recent content by pwu

He's in Israel. Maybe not an option.

I saw no change in LED brightness. Mine are kinda dim. I think they’ve always been that way for the 10 years I’ve owned it.

For those curious, here is how she turned out. I know, some of the 10w resistors are overkill and too big, but their leads are insulated where needed and they work great. Yes, I fit a full size reverb tank in there: wired in parallel with the original smaller tank like the Quad Preamp. The...

There was a trace that somehow got to ground from the EQ switch middle tab. I lifted the LDR lead from the board and wired the wire directly to it. Did the same to the EQ LED leg. All is good now 8)

Output A is fixed. It was a broken trace between .1 cap and the 10k resistor. Still haven’t solved the EQ not disengaging. If anyone has info or knows a thread that could be helpful, please post. Thanks in advance!

Success! The new .1 caps fixed the issue! I thinking many other older Mesa Boogies have this issue with bad Orange Drop caps. Now, I've got two new issues: Output A isn't working. I'm guessing another cap crapped out, or a connection is broken/bridged. EQ isn't turning off. I replaced the EQ...

I just pulled and tested all of the Sprague Orange Drop .1μF caps, and they are ALL bad! The other values I’ve tested are ok. Just placed an order for new parts, and I’ll report back once I get everything installed.

Can this thread be removed now?

I’ve got a Mesa Boogie Studio Preamp that is acting up. It’s worked perfectly fine in the past, but has been in storage for a few years and through a few relocations. The function of the Bass, Mid, and both Output Level potentiometers are not working properly. Cleaning them didn’t help. They...