Connect with us

When was the BC107 introduced?

Discussion in 'Electronic Design' started by John B, Mar 6, 2007.

Scroll to continue with content
  1. John Larkin

    John Larkin Guest

    I worked summers at the University of New Orleans, '64 ish, and we had
    boxes of free Fairchild planar silicon transistors, sent as samples.
    They were roughly 2N2219's.

  2. Joerg

    Joerg Guest

    Not necessarily if you lived in a big city. If not you had three
    options: Take a train to a big city (costs money), go to a 2nd tier more
    local place and risk receiving re-labeled product, or wait until the
    next bulk waste collection day comes around and develop Eagle's eyes for
    spotting "high-yield" TV sets. There were some brands we wouldn't touch
    with a 10ft pole.

    I am not complaining at all because this taught us a valuable lesson
    before even thinking about an engineering career: Make do with what's
    available. Don't do boutique designs or copy magazine ideas that clearly
    contain unobtanium parts. Remember all those tunnel diode or UJT
    oscillators? Plain baloney because no ordinary person could ever lay
    hands on one. At least not over there. So I did audio stuff with AF239
    transistors which is like hauling firewood in a Porsche. But it worked
    and they were free. Well, except for the band-aids needed after
    extricating them from tuner boxes but mom paid for those ;-)
  3. Jim Thompson

    Jim Thompson Guest

    I built my first TUBE radio kit around 1948, and was astonished when I
    received WBZ (Boston), around 600 miles away ;-)

    ...Jim Thompson
  4. Jim Thompson

    Jim Thompson Guest

    I used Motorola RF power transistors for my stereo ;-)

    ...Jim Thompson
  5. Joerg

    Joerg Guest

    That depends on which country you lived in at that time. I remember that
    we made regular 100 mile+ trips to the Netherlands because they had
    these great surplus stores (dump handel). An excursion to London was
    done with a sparsely packed backpack and on the return trip it was chock
    full of electronics parts. And when my father brought a magazine from a
    business trip to the US I could only drool.

    But look at today: You can get anything you heart desires for pennies at
    Digikey, Maplin and places like that. And what does our youth do?
    Hanging around their Sony Playstations all day long. I just fail to
    understand that.
  6. John Larkin

    John Larkin Guest

    I loved tunnel diodes, and the slower ones were cheap, right out of
    the Allied catalog. Germanium Power Devices still makes them, I think,
    and the production process is amazing. Last one I bought from them, to
    fix an HP TDR, cost about $80.

    Back when Haltek was still around, I found a bin full of TDs back in
    the dust. Bought them all for 10 cents each.

    CK722's started at about $7, but got cheap fast. 2N107's (npn ge) were
    a buck or so from the start. But a dollar would buy a burger and a big
    frozen mug of root beer back then.

  7. Joerg

    Joerg Guest

    Well, yeah, you worked there :)

    After the original one blew I had a Motorola 6W RF transistor in a 10W
    FM rig because the 10W edition was too pricey for someone in college.
    Well, I could have dipped into the beer budget but there are some things
    man doesn't do.
  8. Guest

    Texas Instruments had an August 1954 data sheet for the commercially
    available "Silicon grown junction transistors", types 903, 904, 904A,
    905 and X-15.
  9. Phil Allison

    Phil Allison Guest

    ** Most folks idea of " commercially available " is when a product is
    offered to industry at a viable price level.

    Supplying them to the US military for over US $100 each in 1954 hardly

    ........ Phil
  10. Joerg

    Joerg Guest

    Ouch, that is expensive. But not if it fixes a TDR rig, of course. We
    had no Allied over there and distributors would not sell to hobbyists
    even if you fell onto your knees. At the university I joined the RF
    institute and a whole world opened up because suddenly distributors
    courted us. Heck, once I even netted a nice cigar.

    We have a Halted store in Sacramento. Is that the same local chain? It's
    mostly surplus stuff and quite a drive from here. AFAICT it's the only
    such store left.
    50c would buy you a nice 400ml Pilsener in Germany back then, about 80%
    of a pint. A brand name transistor could set you back eight of those.
    Too much of a sacrifice so we tended to improvise or use tubes. I
    believe said Pilsener now costs 2-3 Euros while transistors can be had
    for a dime in small qty.
  11. John Larkin

    John Larkin Guest

    We still have a Halted. Haltek, no relation, was driven out by the real estate bubble.

    Halted (Hal and Ted) is famous for being offered Apple stock (by Steve
    and Steve) as payment for parts, and turning down the offer.
    Heck, I can remember draft beer for 25 cents on Bourbon Street, and
    oysters for a dime.

  12. That's a good reference. That was a TO-18 metal-can part,
    fairly advanced, perhaps more than the TO-18 BC107.

    A popular plastic version, the 2n4401, came much later.
    In fact, didn't the TO-92 package arrive several years
    after the 2n2219? I remember Fairchild's epoxy package,
    which I used a lot about 1965. TO-105 and TO-106, IIRC.
    It was cool to look at, with its black dome and gold-
    plated leads, projecting through a frame. Except, ahem,
    eventually they made parts that sometimes worked loose.

    The TO-92 package came later and looked rather cheap on
    the surface. Yes, it was cheaper to produce, but it was
    far more reliable. I'd guess about 1966 to 1967 for it
    to really take hold? Or was it later?
  13. Eeyore

    Eeyore Guest

    My first 'real' audio mixer used TI's BC184s and BC214s. They are TO-92 and were
    clearly well established by 1971 when I built it. The BC214 family was also
    about the first popular PNP low-level silicon device over here. The 2N3904 etc
    family never really took off in a big way in the UK.

    The cost saving wrt metal can devices was very significant.

  14. Phil Allison

    Phil Allison Guest

    "Winfield Hill"

    ** See ABSE under Glob Tops.

    Nostalgia, big time ....

    ........ Phil
  15. John  Larkin

    John Larkin Guest

    These were TO-5's. Lots of gold.
    Early IC's, opamps and RTL, were in that black-dome package.
    First there was the GE plastic package, with a round base and a
    cylindrical top with a flat on the side. The very top was concave. The
    early units used a brown translucent epoxy and were photosensitive as
    hell... that caused all sorts of mysterious effects, hum and offset
    shifts and such.

  16. Ah, those were the Sperrmüll days, the foundation of my electronics
    activities as well. Mostly old TV sets, sometimes even color (with those
    big-ass PL519 tubes). Precious few transistors. My hobby electronics book
    mostly called for the AC122, and I owned about six of them total, which were
    carefully rotated through projects.

    But I stripped the PCBs of those TV sets bare. Life became more heavenly the
    day my dad gave me a desoldering pump for Christmas. Still have boxes full
    of parts in my parent's basement.

    Sperrmüll is mostly gone these days, but I still can't just pass a pile of
    trash when I see it. And fortunetaly there is one right across my office
    where other people from the labs occasionally dump stuff. Just last week I
    rescued a PCB with five PA88 HV Opamps on it.

  17. Yes, the "Sperrmuell" was a cornucopia for parts and inspiration to
    build new projects.
    The kids today missed the sperrmuell, but they don't knew it! :-(

  18. BC107 was already in radios around 1969

    I would have to think hard, but in 1968 I used some IIRC.
  19. SioL

    SioL Guest

    I also have this "defect" from the young hobby days. Mostly old tv
    sets, with IF stages that provided invaluable tunable ferrite coils.
    Worked just great for SW bands.

    Those big metal IF cans often came with germanium detectors, OA91
    was it? Excellent diodes. And the huge OC transistors.
    The salvaged PL519 tubes were used for rf amps. Than the pots,
    speakers etc.

    Its hard to shake this "defect" off, the thrown-away electronics just
    "calls" for inspection, even though you know its not worth the trouble

  20. SioL

    SioL Guest

    Its too easy nowadays. I wonder what would come of us guys if we had everything, like todays
    kids do.

    Back than you'd usually start with some kind of radio related projects and would eventually develop
    a very good feel for the analog stuff.
    Nowadays you'd probably be starting with digital and never get hands-on experience with analog,
    unless you really had to.

Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day