Hi Roy.

18-Dec-03 04:06:53, Roy J. Tellason wrote to Greg Mayman


 RJT> Greg Mayman wrote in a message to Roy J. Tellason:

 RJT>> Got some fairly hefty transistors here,  stud-mount package with
 RJT>> a 1/4"-28 stud on the bottom of the package.  The ECG book I
 RJT>> have here handy calls that a "TO61" package,  and they list a
 RJT>> variant with an isolated stud (which this is not),  and the
 RJT>> version I have is called out for ECG73,  which does not appear
 RJT>> anywhere else in the book.

 GM>> I haven't seen transistors like that for about 40 years. But a
 GM>> lot of SCRs use that package.

 RJT>> There can't be _that_ many different types of numbers that use
 RJT>> this package

 GM>> HA! I wish.....

 RJT>> Anybody care to guess as to what assumptions might be reasonable
 RJT>> for these?

 GM>> Yep. For my money they are SCRs.

 RJT> I don't think so,  but let's see what an ohmmeter has to say
 RJT> about it...

 RJT> Nope.  Reads like an NPN transistor,  with the pin that's common
 RJT> to the case being the collector,  I'm guessing

 GM>> But IMO doing some tests will be the only way you'll find what
 GM>> they are, and even then ratings will be purely guesswork.

 GM>> Unless of course you can find their part numbers.

 RJT> They're pretty dirty,  I need to figure out something I can clean
 RJT> them with that won't affect any numbers that might be on them

try water,  try alcohol, try light oil, try mineral turpentine,
try carburtettor cleaner, try paint thinners, try acetone.  in that order.

 RJT> Bet they'll carry a bunch of amps,  at least...

:)


 -=> Bye <=-

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