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Old 3rd June 2009, 08:31 AM   #1
Bakmeel is offline Bakmeel  Netherlands
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Default Need Old Germanium transistor datasheets

Hi all,

I've recently run into a small stock of 'ancient' germanium type power transistors, but I can't find any datasheets on the web.

I have:
GD170A and GD241B

Both types are in TO66 case, manufactured by a german company named " RoeHRENWERK NEUHAUS", also known for making radio tubes.

The transistors are manufactured in 1975 and 1973.

If anyone has data on these transistors, I would greatly appreciate a pdf or paper copy.

If you need furter info, PM me.

Thanks,
Bouke
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Old 3rd June 2009, 10:03 AM   #2
Netlist is offline Netlist  Belgium
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GD170A:
Germanium PNP; AF power output
VCB: 32
VCE: 20
VEB: 10
IC: 3
PD: 6
ft: 1Mhz
hfe: 110

There is GD170(A....C) but I can't find what the letters are for. Perhaps hfe.


GD241B:
Germanium PNP; AF power output.
40V, 3A, 10W
No other data.

/Hugo
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Old 3rd June 2009, 10:54 AM   #3
Bakmeel is offline Bakmeel  Netherlands
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Thanks Hugo,

Somewhere I knew you would have data about these...
I have a bunch of AC125 and AC128 as well... I'm looking to adapt one of Nelsons designs to build a Germanium preamp.

I have to take a better look at your Telefunken schematics first to get a feel on "Germanium Design" ;-)

By the way: come to notice that the AC125 and AC128 are quite popular in guitar amplifiers, and they tend to become rare... D'you happen to have any idea on what these babies are worth?

Groeten,
Bouke
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Old 3rd June 2009, 11:35 AM   #4
Netlist is offline Netlist  Belgium
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That would make an interesting project. What I know of Ge's is that they tend to leak quite a bit over time, and that the turn on voltage is lower, 0.2 instead of 0.6V.
Interestingly, they are know for a typical sound that is apparently much sought after. Perhaps its nostalgia but I'd like to know what kind of distortion makes them sound the way they do.

I still have a few pairs of AC128/AC176, probably matched, that I can send you for shipping costs if they end up in a nice project.

/Hugo
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Old 3rd June 2009, 12:56 PM   #5
Bakmeel is offline Bakmeel  Netherlands
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That is a very kind offer! Thank you!

But perhaps no need... I have about 90pcs AC125 and 70pcs AC128, 20pcs GD170 and 30pcs GD241... all brand new in the box.... (the GD170's and GD241's are actually still in their original boxes, as sold from Anna Seghers Neuhaus...)
Then there's a bunch (about 30 or so) OA5, OA85 and OA202 diodes. To me it's a little goldmine....

Thanks to Porcino for that.. he let me have them when he was cleaning up his grandfather's attick....

Perhaps less convenient, they're all PNP types... so either I would need to draw up a design using only PNP, or I would need to get myself a few NPNs.. then I think I have enough trannies here to make a matching pair....

Anyway I would need more help making the design... but I'll put that discussion in the Pass forum one I have something to work on.
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Old 3rd June 2009, 01:23 PM   #6
Merijn is offline Merijn  Netherlands
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Sorry for that, sir...



Merijn aka Porcino
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Old 3rd June 2009, 04:33 PM   #7
Netlist is offline Netlist  Belgium
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Quote:
Originally posted by Bakmeel
That is a very kind offer! Thank you!

But perhaps no need... I have about..........

I'm jealous. I only have a VERY small portion of what you have collected.
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Old 3rd June 2009, 06:23 PM   #8
Merijn is offline Merijn  Netherlands
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Hi Netlist,

I can have a look in my attic but I am afraid I'm allmost through now. Bouke/Bakmeel has about all of them... I'll keep the tube stock for myself ( ) but I'm willing to share whatever I have left.

Keep you guys posted!

Merijn
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Old 3rd June 2009, 06:45 PM   #9
Bakmeel is offline Bakmeel  Netherlands
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Quote:
Originally posted by Netlist


I'm jealous. I only have a VERY small portion of what you have collected.
Like I said... A little goldmine... :-)

That's exactly why I appreciate so much your generosity Hugo, that is a rare character aspect these days....

Thanks again...
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Old 3rd June 2009, 07:43 PM   #10
Netlist is offline Netlist  Belgium
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I have lots of old stuff lying around in small quantities.
I'm the type that doesn't throw away easily but will never build anything with it.
Most of it can all be had for free since I'm not good in selling stuff but I need to find people willing to build something with it.

/Hugo
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