
RedPlated
Well-known member
GC had a 75’ JMP 50 watt local. Actually a pair of them, a 74’ and a 75’ which appear to have had identical mods to them. I played the 75’ and it sounded really great. Couldn’t figure out who modded it but I picked it up and have 72 hrs to return it.
After getting it home, I’m shocked at how good the amp sounds. It can do low gain, 800 type stuff and gets pretty high gain with tight bottom end. Like a Friedman HBE level of gain.
The amp has a master volume where “volume 1” used to be and gain control where “volume 2” was. There are two knobs in the left inputs. Top one seems to add upper mids, some gain and aggressiveness. The lower one adds some sort of presence. The right top input is higher gain, lower right is slightly lower gain with a bit different feel.
The amp has an extra preamp tube and an fx loop that actually sounds really good.
I looked inside and there’s some stuff I can’t explain. On the left side of the PCB, there are multiple black “pucks” with caps on them. They're glued to the board and seem to run to the extra knobs. Anyone have any idea what these are and/or who may have modded this thing?
I’m still really surprised at how good the amp sounds. It sustains forever and harmonics just fly off the fret board. I have until tomorrow to return it. I’m torn because it sounds so good but I have a ton of amps right now. Plus, the mods are unknown and just a little unconventional.
I’ll attach a few pics.
After getting it home, I’m shocked at how good the amp sounds. It can do low gain, 800 type stuff and gets pretty high gain with tight bottom end. Like a Friedman HBE level of gain.
The amp has a master volume where “volume 1” used to be and gain control where “volume 2” was. There are two knobs in the left inputs. Top one seems to add upper mids, some gain and aggressiveness. The lower one adds some sort of presence. The right top input is higher gain, lower right is slightly lower gain with a bit different feel.
The amp has an extra preamp tube and an fx loop that actually sounds really good.
I looked inside and there’s some stuff I can’t explain. On the left side of the PCB, there are multiple black “pucks” with caps on them. They're glued to the board and seem to run to the extra knobs. Anyone have any idea what these are and/or who may have modded this thing?
I’m still really surprised at how good the amp sounds. It sustains forever and harmonics just fly off the fret board. I have until tomorrow to return it. I’m torn because it sounds so good but I have a ton of amps right now. Plus, the mods are unknown and just a little unconventional.
I’ll attach a few pics.


