Bugeyed Earl
Member
Hello all,
I recently horse traded my way into a .22+ Studio combo that I suspect will be a keeper, but it has a few minor issues I'd like to resolve. This unit has a build date of 1991 and no graphic EQ.
The original footswitch seems to engage the lead channel whether the switch (and LED) is on or off - I can only get to the clean channel when I unplug the switch. Touching the switch cable tip to ground engages the lead channel as it should. Oddly, I tried a Fender switch on the .22, and it worked fine, but the Mesa switch won't switch off the lead channel on the Fender. I opened the switch and didn't see anything unusual, it reads 0 ohms when it's switched off, but the amp still seems to find a path through the switch somehow.
Digging deeper, I measured 41 volts at the footswitch jack on the Mesa. Is the 41v measurement on this circuit reasonable for this amp?
I found a few schematics on the internet, but I'm not convinced that I have a legit version. Does Mesa provide schematics on request?
I recently horse traded my way into a .22+ Studio combo that I suspect will be a keeper, but it has a few minor issues I'd like to resolve. This unit has a build date of 1991 and no graphic EQ.
The original footswitch seems to engage the lead channel whether the switch (and LED) is on or off - I can only get to the clean channel when I unplug the switch. Touching the switch cable tip to ground engages the lead channel as it should. Oddly, I tried a Fender switch on the .22, and it worked fine, but the Mesa switch won't switch off the lead channel on the Fender. I opened the switch and didn't see anything unusual, it reads 0 ohms when it's switched off, but the amp still seems to find a path through the switch somehow.
Digging deeper, I measured 41 volts at the footswitch jack on the Mesa. Is the 41v measurement on this circuit reasonable for this amp?
I found a few schematics on the internet, but I'm not convinced that I have a legit version. Does Mesa provide schematics on request?