"Roy J. Tellason" bravely wrote to "all" (11 Dec 03  20:16:58)
 --- on the heady topic of "*big* transistors"

 RJT> Got some fairly hefty transistors here,  stud-mount package with a
 RJT> 1/4"-28 stud on the bottom of the package.  The ECG book I have here
 RJT> handy calls that a "TO61" package,  and they list a
variant with an
 RJT> isolated stud (which this is not),  and the version I have is called
 RJT> out for ECG73,  which does not appear anywhere else in the book.
 RJT> There can't be _that_ many different types of numbers that use this
 RJT> package (no numbers are apparent on it,  though maybe cleaning them up
 RJT> a bit will help).
 RJT> Anybody care to guess as to what assumptions might be reasonable for
 RJT> these?
 RJT> I'll bet I can find something to do with them...   :-)

I can't find the ECG73 either. Perhaps it is a misprint? IIRC that stud
mount case style was seen in old GM-Delco radio hybrid tube/transistor
as the final power out. The only thing I can suggest is to put a test
unit on a transistor curve tracer that can drive those big babies to
their voltage and current limits. Like... experiment with them! ;-)


... When I was your age, we carved transistors out of wood.
--- Blue Wave/DOS v2.30