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    Vacuum Tubes (Valves)

    I'm just an old *art who was around when vacuum tubes were still taught in school, and was an in-home TV/radio service tech. Vacuum tubes are infinitely more forgiving when over-stressed than semiconductors. When somebody finally uses an EMP, your ancient, novelty, laughing-stock old-*arts...
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    Beware buying from china

    My additional input, not already mentioned, is that you do not want use any China-made metal products in safety applications as they will wear too fast, IF they don't fail completely first. Tools and car parts (some actually boxed in previously reputable manufacturer packaging), are trouble...
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    Thread gauge for extremely small screws?

    McMaster Carr doesn't have a thread gauge small enough for my screws. (Size 1 is as low as they go) Delta Prime's chart is pretty interesting though. It looks to me like I probably have the screw size '0', and they are obviously fine threads. Didn't know there was a screw size 'zero'. At...
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    Thread gauge for extremely small screws?

    Thanks Bluejets & Delta Prime. I used to work in a Standards Lab, and those guys used to pull their hair out trying to use an optical comparator to figure-out the size and thread count of some of the screws I used to bring them for identification. I'll take a look at McMaster-Carr and see if...
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    Thread gauge for extremely small screws?

    Does anyone know a manufacturer that makes a metal (not cheap plastic) thread gauge so I can identify my zillions of extremely small screws. Nothing I can find on Google IDs the super small threads. (I know there's a type of thread that is called 'super fine'. What I need is hopefully a...
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    Identify Vintage International Rectifier Part?

    bertus nailed it. It's a bridge rectifier. Kind of ingenious for an early self-contained assembly. Thanks for solving this mystery for me. bertus is one heck of an electronics sleuth.
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    Google plans to scrape everything you post online to train its AI

    AI only 'knows' what programmers put into it. The 'bias' of college grads these days is a part of what they're allowing to be put into everything they do. They disregard what their bias doesn't agree with.
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    Identify Vintage International Rectifier Part?

    Thanks bertus, I'll check this out as soon as I find time and will post the results. Makes a lot of sense and explains International Rectifier's core dedication to 'rectifiers'. I really appreciate your time and effort in trying to identify this component.
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    Identify Vintage International Rectifier Part?

    The threaded stud is for mounting only. No variable adjustment on this contraption. I don't know what other devices International Rectifier made in its early years. I believe it's probably SOME type of rectifier assembly. Unfortunately, I therefore think it may have been a special order...
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    Identify Vintage International Rectifier Part?

    Anyone know what this part is? Found 15 of them in my parts stock, I'm thinking maybe a custom-made device that will go into the trash if I can't identify them. (Don't remember what they went into). 61-7029 (Nothing on Google) International Rectifier El Segundo CA From the stud end: Black(1)...
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    Thought for the day .....

    Don't mess with old people, we don't have that much left to lose if you screw with us.
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    Identify 1960's Diode Manufacturer By Logo?

    The 'bright boys' in the 1950's, 60's, and 70's were the ones who got the ball rolling into what electronics is today. The 'bright boys' today consider early electronics tinker-toys for rubes. What the hell. Out with the old, and in with the new. In another 10 years today's components will be...
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    Identify 1960's Diode Manufacturer By Logo?

    Thanks 73's de Edd for identifying that manufacturer, and Harald Kapp for going the step further and providing proof positive that 73's de Edd (and this old guy) still have what counts in the memory department. Let some college kid fresh out of school do what you two did, I'd like to see that...
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    Help identifying a transistor

    Trivia: My experience with US auto makers is that they buy the rights from the semiconductor manufacturer for their devices. Specifically so that you as the consumer don't know what the electronic parts are and need to go back to the manufacturer to replace the entire assembly. They call that...
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    Identify 1960's Diode Manufacturer By Logo?

    Whoops, didn't see the 'H' picture in the first post, so reposted it here and don't know how to delete this repeated post. Here's the picture of that letter 'H' with a lightning bolt through it. Maybe it's a Roman Numeral 2 with a lightning bolt? Any guesses as to what the name of the company was?
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    Identify 1960's Diode Manufacturer By Logo?

    Here's the picture of that letter 'H' with a lightning bolt through it. Maybe it's a Roman Numeral 2 with a lightning bolt? Any guesses as to what the name of the company was? As an added bonus to other curious members, I'm also showing a manufacturer logo I've seen a lot but couldn't remember...
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    Identify 1960's Diode Manufacturer By Logo?

    Harold Kapp, first thing, asked for a picture. I'll go back through my box of diodes and find one that isn't faded. I see not only my own curiosity is peaked on this. I'm probably mistaken, but I think in the 1960's primarily the US and Britain were the big semiconductor mfgrs, so I though this...
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    Identify 1960's Diode Manufacturer By Logo?

    The ink is too faded to have it show-up in a picture. It's not Harris (unless they had an earlier logo with a lightning bolt instead of a waveform). This is a curiosity thing for me. I thought I got-in on the ground floor when TTL was the big to-do in the early 1970's I used to know all of the...
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    Identify 1960's Diode Manufacturer By Logo?

    I used to know (now old) electronic component manufacturers. When I was younger I just never realized companies would merge or go out of business. This 1960's company made many of my diodes, it's logo is the capital letter 'H', with the crossbar in the letter replaced with a lightning bolt. Any...
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    Need help with ultrasonic cleaner

    Only other thing I can think of off the top of my head, is that the heater has a thermal cut-off. I still believe the unit may be defective, but try reducing the heat and see what happens. Yes, you may also be right that there's a problem with the controller board, but I always try the simple...
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