Grabbed this Pignose 7-100 off reverb.com recently. the seller believed it didn’t work while I believed I could fix it. the price was really good for the reason.
It was a luck. this little thing works fine without any issue. I see 4 Germanium transistors on the circuit board and expected a different sound than the current product. but it sounds pretty much close to the new ones.
According to the schematic I got from https://music-electronics-forum.com/showthread.php?t=8790 , it has 4 transistors.
Two of the germanium transistors (in the black housings) are sitting around the black hood which covers transformers. they seem to be 2SB324H. and I barely see 2SB172A and 2SB175B on the circuit board.