OC50/51 point contact germanium transistors

M

Mark Aitchison

Guest
Does anyone have very old (1950s) transistors (or know of a
collection/semiconductor museum with any)?

I am interested in photos of them and, if possible, simple tests to be
carried out on these grey-haired old timers. I'm also interested in
reports of anyone with old (preferably pre-"OC71") transistors, or
interesting rare germanium and early silicon transistors. Also I could
be interested in buying germanium transistors including the not-so-rare
AC126/128 series, but it looks like there are plenty of places to find
old 2N- types.

Mark A
 
Mark Aitchison wrote:

Does anyone have very old (1950s) transistors (or know of a
collection/semiconductor museum with any)?

I am interested in photos of them and, if possible, simple tests to be
carried out on these grey-haired old timers. I'm also interested in
reports of anyone with old (preferably pre-"OC71") transistors, or
interesting rare germanium and early silicon transistors. Also I could
be interested in buying germanium transistors including the not-so-rare
AC126/128 series, but it looks like there are plenty of places to find
old 2N- types.
Click to expand...
I'll have to look in my junk box !

Graham
 
"Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:45E3D036.EFEBDE78@hotmail.com...

Does anyone have very old (1950s) transistors (or know of a
collection/semiconductor museum with any)?

I'll have to look in my junk box !
Click to expand...
I still have the old, original Philips manual somewhere.


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On 2/26/07 5:21 PM, in article 45e3879d$1@clear.net.nz, "Mark Aitchison"
<MarkA@protov.plain.co.nz> wrote:

Does anyone have very old (1950s) transistors (or know of a
collection/semiconductor museum with any)?

I am interested in photos of them and, if possible, simple tests to be
carried out on these grey-haired old timers. I'm also interested in
reports of anyone with old (preferably pre-"OC71") transistors, or
interesting rare germanium and early silicon transistors. Also I could
be interested in buying germanium transistors including the not-so-rare
AC126/128 series, but it looks like there are plenty of places to find
old 2N- types.

Mark A
Google!
Click to expand...

Bill
-- Fermez le Bush--about two years to go.
 
Salmon Egg wrote:

Google!
Click to expand...
The problem with searching is that a short name like "OC50" comes up in
many, many places - to do with everything from Zulu warriors to European
ovens! And so many chemistry experiments (something to do with Observed
Concentrations). Even putting in an extra word, like germanium, doesn't
get me very far - some histories, Mr Transistor and others (including
Andrew Wylie in this newsgroup back in '96) also looking for them, and (you
might guess...) those chemical experiments again.

But I can find enough references to slightly more modern transistors,
like the AC128; quite often these are via "parts finder" services that
require something like US$500 of each part, and for all I know they all
point to the same place. Oh, and I have to join first. Still, there are
a few places like AMS with stock of the later germanium transistors like
AC126, AC128 etc but even these are expensive or scarce.

The hard bit is finding *any* OC50 or OC51 point-contact transistors for
sale (and I'm not even sure any working ones exist any more).

Mark A.
 
Mark Aitchison wrote:

Salmon Egg wrote:

Google!

The problem with searching is that a short name like "OC50" comes up in
many, many places - to do with everything from Zulu warriors to European
ovens! And so many chemistry experiments (something to do with Observed
Concentrations). Even putting in an extra word, like germanium, doesn't
get me very far - some histories, Mr Transistor and others (including
Andrew Wylie in this newsgroup back in '96) also looking for them, and (you
might guess...) those chemical experiments again.

But I can find enough references to slightly more modern transistors,
like the AC128; quite often these are via "parts finder" services that
require something like US$500 of each part, and for all I know they all
point to the same place. Oh, and I have to join first. Still, there are
a few places like AMS with stock of the later germanium transistors like
AC126, AC128 etc but even these are expensive or scarce.

The hard bit is finding *any* OC50 or OC51 point-contact transistors for
sale (and I'm not even sure any working ones exist any more).
Click to expand...
Why fret over an OC50 ?

Btw, you should learn to use the right search terms in Google !
http://www.google.com/search?&q=oc50+transistor

Graham
 
On Wed, 28 Feb 2007 01:59:42 +1300, Mark Aitchison
<MarkA@protov.plain.co.nz> wrote:

Salmon Egg wrote:

Google!

The problem with searching is that a short name like "OC50" comes up in
many, many places - to do with everything from Zulu warriors to European
ovens! And so many chemistry experiments (something to do with Observed
Concentrations). Even putting in an extra word, like germanium, doesn't
get me very far - some histories,
snip
Mark A.
Click to expand...
Ah but if you add the word "transistor" to the mix you get only four
links. Interestingly also is the old argument about whether it is OC
or 0C and if you change to the zero start letter in Google, then you
still get one link.

Peter Dettmann
 
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