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Thread: Gibson maestro fuzz tone issues

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    Question: are there heat sinks one can get that fit over these transistors, and if so, does that improve their relliability, or rather the biasing reliability?

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    Master Destroyer nosaj's Avatar
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    Quote Originally Posted by Mark Hammer View Post
    Question: are there heat sinks one can get that fit over these transistors, and if so, does that improve their relliability, or rather the biasing reliability?
    There are I can't find any pics of the old ones I've seen in old solid state devices but here are some options
    https://www.cricklewoodelectronics.c...s-and-ICs.html
    This next one is similar to what I remember piece of aluminum wrapped around the transistor some had holes to mount to chassis otheres were free standing.
    https://www.alibaba.com/product-deta...770237381.html

    nosaj

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    Binkie McFartnuggets‏:If we really wanted to know the meaning of life we would have fed Stephen Hawking shrooms a long time ago.

  3. #38
    Supporting Member mozz's Avatar
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    The 2n270 weren't to-5, slightly smaller. I think he is using OC transistors which might be the same diameter as the old germanium output trannys such as 2sb**. They used a wrap-around aluminum heat sink.

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    Old Timer J M Fahey's Avatar
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    Quote Originally Posted by Mark Hammer View Post
    Question: are there heat sinks one can get that fit over these transistors, and if so, does that improve their relliability, or rather the biasing reliability?
    These transistors dissipate VERY little, do the Math using around 1.5V DC and less than 1 mA , see the above currents I calculated and you´pll end up with feeble 1 or 2 milli Watts

    No dissipation=no self heat rise=no need for heatsinks.

    On the contrary, these transistors will happily drift all over the place with *ambient* temperature variation, and heat sinks do nothing about that.

    I respect and salute innovation, and germanium transistors were a huge step ahead ... comparing to nothing at all that is, but only Silicon signalled the "coming of age" which led to current World domination and then some.

    My brain explodes trying to imagine ICs and modern Digital Electronics running based on Germanium

    As in: they would not exist.

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    Juan Manuel Fahey

  5. #40
    Supporting Member mozz's Avatar
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    Russians were way far ahead of the US on germanium. A lot of the Russian transistors you can buy now, date coded 70's-late 80's, have no leakage. I was also reading somewhere on germanium to start being used for computer chips, they are faster than silicon.
    https://www.sciencenews.org/article/...-silicon-again

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    Old Timer J M Fahey's Avatar
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    Yes, that Science article says so ... but reading the fine print:

    Germanium computer chips gain ground on silicon — again
    Excerpt from the February 25, 1967, issue of Science News
    Oh well

    Yes, traditionally Russians (well, at least the Soviets) "junk nothing".
    They go on advancing but keep old stuff working if it proved reliable in its own field.

    Typical of Military thinking, I remember reading in 2002 or so about what then was the last surviving Tube Factory in USA, who "if asked" could make excellent 6L6 ... for about $60 (some $120 in today's prices) who of course could not compete with $12/$15 Russian and Chinese versions.

    Their only commercially viable product at the time was a miniature "grain of wheat" sized UHF diode (vacuum tube of course) which was bought regularly in quantity by US Govt (who of course does not care about price) for dual purpose:
    * detector in some USAF electronics countermeasures detector, they bought a ton of those to be used in the Iraq invasion, because Saddam´s missiles used outdated Russian electronics and the Vietnam era ECM pods were best for that.
    * again detector in some Hewlett Packard or Tektronix Lab equipment which apparently was in *every* University and Govt Lab.

    It was sad to see the aged "should have retired 10 years ago" Engineers, trying to keep the Factory running, and all the very dated equipment which if broke would be irreplaceable.

    FWIW I once repaired Medical equipment and was amazed to find, inside Gas in Blood analyzers and Blood PH analyzers coexisting "pencil tubes" , Germanium transistor SMPS (high voltage flyback generators), silicon transistor modules, TTL logic chips and in one, early Microprocessors.

    Apparently they apply the "you don´t mess with a winning team" Logic ... which in this case is very sensible.

    Besides, given the red tape involved around anything Medical plus the huge possibility of malpractice attacks by greedy Lawyers, I bet that the safest course is to keep time honored and tested stuff as long as possible.
    Parts cost is again irrelevant.

    *Somebody* must keep all those obsolete/unavailable parts suppliers in business

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    Juan Manuel Fahey

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