Frankly, screw the idea of ordering $30 transistors or paying big shipping
charges from Canada. Just go to Ebay, find a cheap TM50X power module,
bingo! you're in business! Either use the module as-is or salvage the
transistors from it and repair the TM501.
TM501 modules are rather hard to find and tend to be expensive. There are
several TM506's for $25 Buy-it-Now (plus $33 shipping). A little patience and
shopping should net a TM502,503, or 504 for under $30 shipped...
I would still go the way of a TO-220 with the leads swapped with wires. A
little sleeving and they would be just as reliable as the "proper" transistor,
no matter what physical abuse they are subjected to.
My main current probe setup is a TM504+SC503 analog storage scope+2 AM503B
amps+A6302 probes (also have A6303's). The A6302 current probe actually runs
on pure magic... there's just no other explanation why it can do what it does.
Measure DC-50Mhz at milliamps to 20+ amps without making electrical
contact... yeah, right. Next, you'll try to blame it on some silly hall
effect... but we know magic when we see it...
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