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Old 03-22-2008, 09:51 AM
RetroHacker RetroHacker is offline
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Join Date: Jan 2005
Location: Niskayuna, NY
Posts: 456
6BK4 jingle

Thought I would make this it's own thread, and do a quick poll about this. I noticed in my Penncrest CTC-15 clone, when I pulled the 6BK4 out, it jingled. The used tube that came with the set also jingled when it was tilted. What causes this? I know tubes like the 83 have mercury inside, and those can jingle or appear to have metal inside them, but a 6BK4? In both cases, I was unable to see anything loose inside the tube. And both tubes worked (although one failed after about five hours of use)

Another AK'er commented that he noticed jingle in his tube. Is this something common to all 6BK4's? A common failure? Coincidence?

Inquiring minds want to know.

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Old 03-22-2008, 12:36 PM
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kx250rider kx250rider is offline
Join Date: Oct 2005
Location: Los Angeles & Dallas
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That's weird. I don't remember seeing any 6BK4s with loose parts inside; at least no more than any other tubes. I'd replace it. They're a dime a dozen. I don't think there's any way that the TV could have caused this. Probably just two tubes that were both dropped at one time.

Collecting & restoring TVs in Los Angeles since age 10
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Old 03-23-2008, 09:30 PM
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old_tv_nut old_tv_nut is offline
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Lumpy vacuum?
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Old 03-23-2008, 09:45 PM
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Dave A Dave A is offline
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Location: SE Pennsylvania
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Loose chips of glue in the base bouncing off the bottom of the glass?

Dave A
“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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Old 03-23-2008, 10:11 PM
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fsjonsey fsjonsey is offline
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Join Date: Jul 2006
Location: Northeast Ohio
Posts: 539
I have a feeling that the 6bk4 will be a tube we'll never have to worry about running out of.
This device isn't a spaceship, it's a time machine. It goes backwards, and forwards... it takes us to a place where we ache to go again.
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Old 03-24-2008, 01:43 PM
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bgadow bgadow is offline
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That's a pretty simple tube-not too much can go wrong. I haven't seen a pattern of rattles in them, but various tubes I've had over the years have done it. Sometimes a little piece of glass rattling around, or a chunk of glue in the base like Dave mentioned. Some tubes have insulators/seperators that will just naturally rattle.
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