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Tell me about my tube tester

Discussion in 'Shock Brother's DIY Amps' started by ArcticWhite, Apr 13, 2021.

  1. ArcticWhite

    ArcticWhite Tele-Afflicted

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    It's a "Dial Junior" made by Custombuilt in San Francisco.
    Bought it for twenty bucks from a guy outside a bar on a Saturday afternoon about five years ago. It works very well so far, I've tested hundreds of tubes, and only one bad tube has crept through.

    I do plan to change the big cap and all the carbon comp resistors.

    20210412_223323.jpg 20210412_223346.jpg 20210413_142025.jpg 20210412_223323.jpg 20210413_142034.jpg 20210413_142020.jpg
     
  2. DavidP

    DavidP Friend of Leo's

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    I salute the person who wired this up...
     
  3. Preacher

    Preacher Friend of Leo's

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    I got anxiety just from looking at that.
     
  4. archetype

    archetype Fiend of Leo's

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    I've never heard of that company. It will sort out the obviously bad tubes and let you move the good ones to an amp for real-world testing. I see a can of Deoxit in your future.
     
  5. Dacious

    Dacious Poster Extraordinaire

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    It can certainly pick tubes with shorted elements but I wouldn't totally trust it's assessment of tubes as good or bad.

    A tube that tests less than good or green could still be serviceable.
     
  6. ArcticWhite

    ArcticWhite Tele-Afflicted

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    Already have it.
     
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  7. Engine Swap

    Engine Swap Tele-Afflicted

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    You'll need another...
     
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  8. Dan German

    Dan German Doctor of Teleocity

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    I used to build card cages for a mil-spec data recorder. 714 wire connections in each cage. That looks more challenging.
     
  9. LudwigvonBirk

    LudwigvonBirk Tele-Holic

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    For at least 150 years, most of the product from the 300-block of Eddy Street in SF has been somewhat enticing, and simultaneously suspect wrt to safety.
     
  10. Zootallures

    Zootallures TDPRI Member

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    Be careful using too much deoxit on tube testers. It can swell the phenolic wafers on the switches and cause problems. If you use it on the switches use a q-tip and only get it on the parts that are making contact. I’ve seen people suggest contact cleaner or 99% alcohol
     
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  11. radiocaster

    radiocaster Poster Extraordinaire

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    Interesting. I think it had one of those rolling things with the chart for the settings, but I think that's in the manual as well.

    So it's all solid-state? The complicated part might be to calibrate it.
     
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  12. ArcticWhite

    ArcticWhite Tele-Afflicted

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    Luckily, it came with a stack of printed settings for just about every tube made before the mid-sixties, as well as the two page instruction manual.
     
  13. Zootallures

    Zootallures TDPRI Member

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    That’s a really cool tube tester! Did the manual come with a schematic and instructions on how to calibrate it? It looks like there’s two potentiometers in the middle behind the meter that are probably for calibrating.
     
    Last edited: Apr 14, 2021
  14. robrob

    robrob Poster Extraordinaire Ad Free Member

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    Robert Hull has a tube tester facebook group if you need any help with it.
     
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