20-08-2016, 10:48 PM
They were not special apart from the printed number on them.
Like the spot ones they were just tested rejects.
I used to buy them unmarked and test them on my home made test set with a range of 5 collector currents to choose from at a fixed VCE.
I still have the test set and used it about a year ago on some power transistors with an external bench power supply to extend the current to a couple of amps or so.
Just don't fix a transistor tester that is not broke.
Like the spot ones they were just tested rejects.
I used to buy them unmarked and test them on my home made test set with a range of 5 collector currents to choose from at a fixed VCE.
I still have the test set and used it about a year ago on some power transistors with an external bench power supply to extend the current to a couple of amps or so.
Just don't fix a transistor tester that is not broke.
