AB resistors, cook dry or leave as is??

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by mcdes, Mar 3, 2012.

  1. mcdes

    mcdes Member of no importance

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    I got some Allen bradley carbon comp resistors, most are less or close to, but below 10%. The odd one is 20%.

    My question is, do I cook them as the instructions say, slowly to remove moisture, and get them back to spec?? Or do I leave as is, and hope for some magic.....
     
  2. Jerry Glass

    Jerry Glass Member

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    I gotta say, I've never heard of a requirement to cook resistors before use.

    Moisture content in any electronic device is a recipe for failure.
     
  3. guiltless

    guiltless Member

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    10%-20% off?!? That will make some significant changes depending on the location.
     
  4. john l

    john l Member

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    Wasnt + or - 10-20% industry standard way back when lol? I know a more than a few people that say this varience is the reason some amps are magic and some amps arent with older makes that use them. I buy old CCs at a local parts yard by me and spend an extra few minutes with a meter as Im picking through what I want less than 5% magic I guess.
     
  5. Baxtercat

    Baxtercat Member

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    Maybe it's enough to just leave 'em in the sun for a while? I definitely heard the racket when I left my Fender amps in a relatively damp basement, btw. It'd clear up after I ran the amps and warmed up the CCs.
     
  6. diagrammatiks

    diagrammatiks Member

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    they aren't ever going to be closer then 10 percent on average.
     
  7. pch64

    pch64 Member

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    I'm not sure if these are AB but they have all drifted (values are now from 54.9K to 56.5K):

    [​IMG]

    Maybe because the bag was damaged.

    I have also some AB's taken from vintage military equipment all in specs. They were covered with some kind of varnish.
     
  8. diagrammatiks

    diagrammatiks Member

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    The mil spec a/b's I've measured have been very reliable.

    five banders though. all the 4 banders have been all over the place.

    [​IMG]
     
  9. mcdes

    mcdes Member of no importance

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    So it seems I should just install them as is?
     

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