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OC50/51 point contact germanium transistors

Discussion in 'Electronic Components' started by Mark Aitchison, Feb 27, 2007.

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  1. 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
  2. Eeyore

    Eeyore Guest

    I'll have to look in my junk box !

  3. I still have the old, original Philips manual somewhere.


  4. Salmon Egg

    Salmon Egg Guest


    -- Fermez le Bush--about two years to go.
  5. 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.
  6. Eeyore

    Eeyore Guest

    Why fret over an OC50 ?

    Btw, you should learn to use the right search terms in Google !

  7. 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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