The PICCOLO will run with any cart. Just turn the gain knob. There is also a way to change the OFF position into a 0dB gain mode by adding a jumper to keep power always on (I do this in the CORNET MC).
Ran out of parts building up proto #3 that uses the surface mount LSK389s, so I'll scavange from #2 and finish it up tomorrow. Then I have to work on parts lists and pricing. The half-kit will have these rare and expensive transistors pre-installed.
jh