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Old 14th August 2008, 02:53 PM   #1
prorms is offline prorms  United States
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Default what are the best germanium transistor npn and pnp ??

what are the best germanium transistor npn and pnp ??

for stomp boxes
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Old 16th August 2008, 09:19 AM   #2
TH.J.B is offline TH.J.B  Poland
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Wow... what a question. What do you mean by that?

Considering low noise: BC550, BC556, BC549B, BC109B, BC547B, BC179, BC477, BC177.

To make a final choice you will need to consult the tables of technical data which are normally provided in catalogues. I suggest this site:

http://www.im.pwr.wroc.pl/~med/jn/karty_katalogowe.html

.pdf files provides information you need.

Peace!

TH.J.B
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Old 16th August 2008, 09:23 AM   #3
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Quote:
Originally posted by TH.J.B

Considering low noise: BC550, BC556, BC549B, BC109B, BC547B, BC179, BC477, BC177.



Only none of these are germanium.
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Old 16th August 2008, 10:10 AM   #4
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that's definately true
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Old 16th August 2008, 12:30 PM   #5
Bone is offline Bone  United Kingdom
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These seem to be the most popular:

PNP

NKT275 - the best
OC44
OC75
AC128

NPN

AC176
AC127
OC140

Regards

Tony
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Old 16th August 2008, 02:24 PM   #6
TH.J.B is offline TH.J.B  Poland
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Ups... I forgot... what a shame these are supposed to be germanium. But is it still possible to buy it?

Peace!

TH.J.B
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Old 23rd August 2008, 09:37 AM   #7
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anyone remember the OC71 ?...oops, showing my age...
(used to be common in the 60s, and you could scrape the paint off and make a phototransisitor...
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Old 23rd August 2008, 10:45 PM   #8
Bone is offline Bone  United Kingdom
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OC71 - Ive got about a dozen of these nicely scraped awaiting an application

Tony
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Old 24th August 2008, 12:30 AM   #9
lineup is offline lineup  Sweden
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Cool Germanium Power Transistors

if you are looking for

germanium power transistors ( >= 1 Ampere )
it is not many complementary pairs PNP + NPN

There are however some powerful devices.
I have found one guy selling NEW EXEMPLARS in Original Package of these:
> 2N268 .. PNP .. 80Volt 3Ampere 30Watt .. looks almost like TO-3
> OC16 .. probably PNP ...in older power case

They do NOT come cheap

Complementary Pairs. Often used are:
--------------------------------------
AC127 + AC128 0.3 / 1 Watt
AC187 + AC188 1 / 1 Watt

So
AC187 (npn) + AC188 (pnp) are one of the few Pairs above 1 Watt

See attached picture of 2N268, 30 Watt PNP
Attached Images
File Type: jpg 2n268_pnp_germanium_30watt.jpg (44.2 KB, 218 views)
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Old 24th August 2008, 12:42 AM   #10
lineup is offline lineup  Sweden
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Cool Germanium Transistor List

There are lists with DATA specifications
of some Germanium transistors.
I will put together one PDF or ZIP file, later.

OC16 .. I mentioned is: PNP, 32V 1.5A 6.25Watt

By the way, in
Solid State forum
if you post germanium question there
you will probably get a lot more info from
Older Electronics Repair Service members.
We have quite a few of those at www.diyaudio.com I know

Enjoy
Lineup
Germanium Transistor History & Info forum

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