what are the best germanium transistor npn and pnp ??

[prorms]

what are the best germanium transistor npn and pnp ??

for stomp boxes

 

[TH.J.B]

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

 

[analog_sa]

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

Only none of these are germanium.

 

[guitar_joe]

that's definately true

 

[Bone]

These seem to be the most popular:

PNP

NKT275 - the best
OC44
OC75
AC128

NPN

AC176
AC127
OC140

Regards

Tony

 

[TH.J.B]

Ups... I forgot... what a shame these are supposed to be germanium. But is it still possible to buy it?

Peace!

TH.J.B

 

[PeteMcK]

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...

 

[Bone]

OC71 - Ive got about a dozen of these nicely scraped awaiting an application

Tony

 

[lineup]

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

 

[lineup]

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