A fellow member over at the TapeOp forums approached me about racking up a pair of Yamaha PM1000 channel strips for him, similar to those I have done in the past. So, he sent them to me and I got to work stripping them down.


Then I replaced all the capacitors and the NPN transistors, which should help eliminate some of the hiss from these things. The EQ frequency points were also modified, as the stock values are somewhat useless. I got to work on the chassis, measuring out the hole placement for all the controls. After it was all mounted and wired, I checked it out and applied some finishing touches, like labels on the front and back and threadlocker on most of the internal screws. The power supply board is one that I designed and etched. I originally was going to use a Power One pre-built supply, but it was dumping a bunch of 60Hz hum into the audio through the EQ inductors, so I went with the LM317-based design and toroidal power transformer.


Another successful racking. These get easier every time.