JMP50 Clone Build, Part 5
I’m making good headway on the JMP50 clone build. Tonight I installed the Marstran power transformer, mains voltage selector switch, output jacks and output impedance selector switch.
Looking at these pictures, it seems like I didn’t actually do much on the amp today. (Truth be told, I’m very cautious when working with fixed leads like the transformer leads—I don’t want to cut them too short. I usually start out cutting them too long, then triming them back until I think they’re just the right size.)
Underside of the laydown power transformer from Brian Wallace at Marstrans. The top bell is painted black to match the chassis.
A close-up of the power tube sockets, output impedance selector switch (left), mains selector switch (right) and HT fuse holder. I’m pretty happy with how my soldering skills are progressing and the work looks neat and tidy over all.
You can also see the lock nuts I used wherever possible. Almost all the hardware is stainless steel.
Speaker jacks and impedance selector switch. Yawn.
PEC potentiometers mounted in the chassis. The PEC pots are stainless steel and you can’t solder the buss bar to the back of the case like you can with other brands, so I’ll need to change the grounding scheme around a little to accomodate this.