2SA1065/2SD2489 substitutes

[Dave]

I'm working on a Technics audio amp from the late 70's with blown outputs.
I've found one source (in Europe) for these transistors, but they're asking
$20 each for them and I am concerned about counterfeits.

They are 150V 10A 120W, with an f(T) of 50MHz... they are faster than
anything I can find out there.

1. Is it important that I replace them with units with comparable
current-bandwidth product?
2. Can anyone recommend a substitute? I was thinking maybe MJ21195/96, but
they're only 4MHz.
3. Can anyone recommend a source for NOS Jap transistors that sells these?

Thanks
Dave

 

[Dave]

"Dave" <dspear99ca@yahoo.com> wrote in message
news:W2sfk.369$Ou3.337@edtnps82...

I've found one source (in Europe) for these transistors, but they're
asking $20 each for them and I am concerned about counterfeits.

Make that 20 Euro, so $32/ea.

 

[Curtis Brown]

3. Can anyone recommend a source for NOS Jap transistors that sells
these?

Why don't you try rephrasing that question you racist cock-suck.

 

[legg]

On Wed, 16 Jul 2008 17:19:23 -0400, "DaveM"
<masondg4499@comcast99.net> wrote:

"Dave" <dspear99ca@yahoo.com> wrote in message news:25sfk.370$Ou3.88@edtnps82...

"Dave" <dspear99ca@yahoo.com> wrote in message
news:W2sfk.369$Ou3.337@edtnps82...
I've found one source (in Europe) for these transistors, but they're asking
$20 each for them and I am concerned about counterfeits.



Make that 20 Euro, so $32/ea.

Consolidated Electronics Inc. is a US company, but they list stock for both
devices.
http://www.ceitron.com/semi/semi.phtml?part=2SA1065 ($4.00 US) and
http://www.ceitron.com/semi/semi.phtml?part=2SD2489 ($11.95 US).
Can't vouch for authenticity... but I've used CEI for several years and have had
no problems with counterfeits.

Contact info:
Toll Free: 1-800-543-3568
scoy@ceitron.com

Consolidated Electronics
P.O. Box 20070
Dayton, Ohio 45420
USA

There are very few sources for bipolar transistors being manufactured
using 'mesa' or 'hometaxial' chip structures. Planar parts are often
labelled and marketed with the older numbers without meeting their isb
capability. Valid PNP parts may be rare as hen's teeth, as they had
few industrial applications, where ruggedness was appreciated ($).

Mind you, mesa parts also weren't noted for high ft. This was
considered as an advantage in audio, as the components in the final
stage had predetermined limits. If you see 47-150pF tacked collector
to base on the final stage, they were throwing the parts' ft statistic
away, in any event.

- it was virtually impossible to get PNP and NPN parts with similar
current and voltage ratings to exhibit similar frequency or capacitive
characteristics. (typical factor 2:1 in favour of NPN for speed). This
is one reason why ft was a 'typical' (untested) characteristic with
these audio parts, rather than a (tested) minimum.
When local compensation was used, it was likely unequal, to take this
into account.

RL

 

[Michael A. Terrell]

"Dave Plowman (News)" wrote:

In article <g5lue4$970$1@aioe.org>,
Curtis Brown <pryce@stripperweb.com> wrote:
3. Can anyone recommend a source for NOS Jap transistors that sells
these?

Why don't you try rephrasing that question you racist cock-suck.

Is it racist to refer to me as a Scot since I'm from Scotland? Call me
Dave when I was christened David? Call someone Tex?

Don't feed the troll.


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Sporadic E is the Earth's aluminum foil beanie for the 'global warming'
sheep.

 

[Curtis Brown]

Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message >

troll.

WHY DON'T YOU SUCK MY FUCKING DICK, BITCH?