17 Jun
2013
17 Jun
'13
11:47 a.m.
Hi all,
__
81 [ti logo] 41 (or maybe 4I but I'm guessing for a date code, 41)
R3004
BRITAIN
DEC part number appears to be 15-12782-00. The printset identifies
them as "NPN 100W S1325 15". I can't find any substitution info online.
To save you a wasted search, neither R3004 nor S1325 are listed in
'Towers International Transistor Selector' -- a book that gives brief
chracteristics of many thousands of transistors. So they must be pretty
unusual.
There is a NOS pair for sale on eBay. So that's
one option. Does anyone
know what the modern equivalent(s) are? And what if you do, where did
you find the reference? >
I've not looked at the printset, what are these transistors used for?
SMPSU chopper? I wonder if you can make sensible guesses as to the
requirements nad pick a more common transistor that will work. But if it
is a chopper, you can get grey heair trying to find one that will work.
My bitter eperience is that if you find a transisttor with simiular
published specifications to the failed chopper it may not work. There are
plenty of other chracteristcs that matter...
-tony