invaderzim
Senior Member
The Chinese! They copy all the classics and sell the PCBs online for peanuts.
Pass
Accuphase
Quad
ML
etc.
While that is handy for the DIYer it isn't the manufacture giving it away. I doubt anyone from Accuphase will tell you which part you can use in place of the hard to get one they used or tell the person making the PCB how to lay it out the better.
That being said some of those Chinese vendors could clean up if they'd work with a fluent English speaker that also understands amps and put together some actual instructions and BOMs.