WTB: DTG 600/ECG 179 PNP transistors
Gryphon
replace the audio frequency amplifiers on them, which I've been told are
PNP power transistors with the corresponding numbers:
Delco: DTG 600
or
ECG: ECG 179
I cannot find any locally, and anyone that can order them in wants to
charge me $34 A PIECE for these things. Suffice to say I refuse to pay
more for a transistor than I paid for the siren itself. If someone is
able to provide me with a source for about four of these devices, please
e-mail me at gryph...@hotmail.com. Thank you.
--
Gryphon
Technical Advisor
i n f i l t r a t i o n
http://www.planetunreal.com/infiltration
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S.J.R.
might try to redesign the driver to use Silicon, may only have to change the
bias resistors.
"Gryphon" <all.sp...@will.be.shot> wrote in message
news:3A7992F4...@will.be.shot...
Chris
here.
Chris
Delco
Jerry G.
are Germanium. Germaniums are very expensive. They are still
used for some specific applications where their characteristics is
critical to the operation of the design. Infact you got a good
price for these. They are even more expensive from many other
dealers.
If you have the knowledge base, the time, and facilities, you can
try to redesign the unit to use standard silicon types. This can
end up being a big project to make it work properly with silicon
transistors.
--
Jerry Greenberg GLG Technologies GLG
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"Gryphon" <all.sp...@will.be.shot> wrote in message
news:3A7992F4...@will.be.shot...
gkesler
Are the DTG 600 and the ECG 179 both TO-3 packages? (round cans with two
leads on the bottom with what looks like two "wings" (a hole near the tip in
each one)?
If they both are then look below for the specs for the NTE 179. NTE parts
almost always have the same number as the ECG parts. (Just substitute the
NTE for ECG this works most of the time)
If you do not already have NTE's Quick Cross software, you should download
it. You can register to down load it FREE at:
If you are doing a lot of repair it makes life MUCH easier!!!
Industry Number : DTG600
NTE Device Number: NTE179
T-PNP GERMANIUM AUDIO AMP,TO-3
Industry Number : ECG179
NTE Device Number: NTE179
T-PNP GERMANIUM AUDIO AMP,TO-3
Cheers,
Greg
*************************************************
Hmmmmm....... Let's see what this does..... (click)(click)
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***Buzz Buzz ...... Spark n Arc***
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OH NO!!!!!!!!
John Popelish
It is quite possible that you will get acceptable results with a big
silicon PNP transistor, considering that many siren circuits are very
non linear amplifiers, anyway. Connect a TIP36 see what happens.
They cost only a couple bucks and handle much higher temperatures that
the germanium transistors.
--
John Popelish
Gryphon
>
> Gryphon (and all others):
>
> Are the DTG 600 and the ECG 179 both TO-3 packages? (round cans with two
> leads on the bottom with what looks like two "wings" (a hole near the tip in
> each one)?
Yup, that's exactly what they are. Apparently they're the most common
thing to blow on these old electronic sirens, and nobody seems to bother
repairing them anymore because these transistors are so expensive. Now
that I think about it, I'd like to lay my hands on as many of these as
possible, in case I find more sirens in the future that need replacement
transistors. However for now, four will do. Thanks for the info so far
guys!
Maarten A.E.Bakker
> The transistors are very expensive by today's standards because they
> are Germanium. Germaniums are very expensive. They are still
Hmm... In Europe there are rather large and cheap stocks of germanium
devices, mostly manufactured in the Eastern part of Europe.. You could try
to cross it to a European type, for example AD149 (50V 3.5A 27.5W) and
see if you can order it from Europe.
--
Greetings, Maarten.