Matching transistors for @sebastian’s kassutronics ladder filter using a simple (3 resistors and a diode) circuit by Ian Fritz:
The transistors from mouser (BC547C-A1) were all very close matches right out the bag, triple zeros on the volt meter for most, some 0.001s.
I also had some some tayda just “BC547.”
These were not nearly as matchy as the mousers, with readings ranging 20mV difference.
Haven’t messed with any of the trimmers and it sounds and feels fantastic! Easily self oscillates with a nice clean tone. And it looks great!