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  • Tube rattle?

    Just when you think I cant ask another newbie question here is yet another!
    I have an old GE rectifier 5Y3GT ...I have had it for a long time. Bought years ago as testing NOS and I never have plugged it into anything. Now that I am well into this lil Princeton amp build I was getting the final parts together and I noticed it has a rattle when I roll it around like something is in the base. It isn't in the upper part of the tube where I can see it it is in the black plastic base. Is this typical? Leftover stuff from the build process?

    I dont have a tube tester that is definitely on the equipment to buy list.
    Regardless if it isnt good a new 5Y3GT is in the parts to buy.

    Dale

  • #2
    Is the plastic keyway intact?
    It's weird, because it WAS working fine.....

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    • #3
      Yep tube looks minty.. but if I roll it over I hear something loose. I can always try it out once I get my transformers and see how she does.

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      • #4
        I've experienced this before with rectifiers on two occasions. Since the tube was working properly otherwise and not causing any amplified anomalies I chose to ignore it. Neither amp ever came back to me with a rectifier failure. Though that doesn't mean I know they didn't fail eventually due to a mechanical fault I suppose.
        "Take two placebos, works twice as well." Enzo

        "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

        "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

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        • #5
          Originally posted by tubedood View Post
          I noticed it has a rattle when I roll it around like something is in the base. It isn't in the upper part of the tube where I can see it it is in the black plastic base. Is this typical?

          Dale
          I realize this thread is a bit dated... But my first thought was that it's probably a chip of whatever adhesive material that was used in adhering the glass bulb to the base.

          I've seen a couple instances of this, and it wasn't a concern as far as safe operation of the tube.
          Start simple...then go deep!

          "EL84's are the bitches of guitar amp design." Chuck H

          "How could they know back in 1980-whatever that there'd come a time when it was easier to find the wreck of the Titanic than find another SAD1024?" -Mark Hammer

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