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Asher Guitars WD Music Products Amplified Parts Mod Kits DIY Nordstarnd Pickups Warmoth.com
Asher Guitars WD Music Products Amplified Parts Mod Kits DIY Nordstarnd Pickups Warmoth.com

Any way to test a 6L6...

Discussion in 'Glowing Bottle Tube Amp Forum' started by charlie chitlin, Sep 25, 2017.

  1. charlie chitlin

    charlie chitlin Doctor of Teleocity Ad Free Member

    Age:
    55
    Mar 17, 2003
    Spring City, Pa
    ...with a regular VOM?
    I just want to know if it's trashed.
    Pretty sure a bad 6L6 shut my amp down.
    The tech said it was bad, but he taped the pair together and said both were bad.
    They were an old set and he figured if one was shot, the other can't be far behind.
    I'm a little more optimistic and would run the OK one in something.
     

  2. archetype

    archetype More tone than talent Ad Free + Supporter

    577
    Jun 4, 2005
    Williamsville NY
    All you can tell with a VOM is whether the heater has continuity and whether things are shorted that shouldn't be. I'd say it's a waste of time. You need a friend with a real tube tester. It the tubes aren't "bad," then stick them in the amp and listen to them.
     

  3. dr_tom

    dr_tom Tele-Meister

    261
    Sep 21, 2013
    Ontario
    I remember the days when my father would send me to the local convenience store with old tubes to test them out on the tube tester! That was always a fun job.
     
    JustABluesGuy likes this.

  4. thegeezer

    thegeezer Tele-Holic

    Age:
    64
    564
    Jul 5, 2010
    West Michigan
    Know anybody with a single ended amp, like a Champ?
     
    telemnemonics likes this.

  5. Old Tele man

    Old Tele man Tele-Afflicted

    May 10, 2017
    Tucson, AZ
    Tubes are "high-voltage" devices, and must be tested using high voltages (typically ~250VDC). They cannot be testing using simple VOM like some transistors.
     

  6. Strato50

    Strato50 Tele-Meister

    Age:
    50
    187
    Mar 30, 2017
    Port Arthur TX
    I am lucky to have my old NRI tube tester...saved me a bunch of time and money.
     

  7. Old Tele man

    Old Tele man Tele-Afflicted

    May 10, 2017
    Tucson, AZ
    The RIGHT tool for the right JOB!
     
    brokenbones and JustABluesGuy like this.

  8. charlie chitlin

    charlie chitlin Doctor of Teleocity Ad Free Member

    Age:
    55
    Mar 17, 2003
    Spring City, Pa
    I was just wondering if there's a way to tell if a tube is shorted or something.
    I don't have a single ended amp that uses a 6L6, and I'm not sure I'd want to use a nice amp as a tube tester.
    I've seen some serious damage happen without the fuse ever blowing
     

  9. Strato50

    Strato50 Tele-Meister

    Age:
    50
    187
    Mar 30, 2017
    Port Arthur TX
    You need a tube tester.
     

  10. dsutton24

    dsutton24 Poster Extraordinaire Ad Free Member

    Dec 29, 2010
    Illinois
    No.

    A VOM has a battery in it, something between three and nine volts, depending. Many times a device will appear to test 'good' with a VOM, then do hideous things when high voltage is applied to it. Add to this that what happens in the internals of a tube changes a lot when it warms up and you can see the difficulty.

    You need to find somebody with a tube tester. Tube testers themselves are no guarantee, but you can at least check emission and check for shorts. Why not just ask the guy who worked on the amp to test them for you?
     

  11. Strato50

    Strato50 Tele-Meister

    Age:
    50
    187
    Mar 30, 2017
    Port Arthur TX
    Send them to me I will test them for you.
     

  12. charlie chitlin

    charlie chitlin Doctor of Teleocity Ad Free Member

    Age:
    55
    Mar 17, 2003
    Spring City, Pa

  13. charlie chitlin

    charlie chitlin Doctor of Teleocity Ad Free Member

    Age:
    55
    Mar 17, 2003
    Spring City, Pa
    Because he's 45 minutes away and I SOMETIMES get one day off a week.
     

  14. dsutton24

    dsutton24 Poster Extraordinaire Ad Free Member

    Dec 29, 2010
    Illinois
    I was trying to be helpful. Just how would I have known either of those things?
     

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