Author Topic: Vacuum tube ok or not?  (Read 2413 times)

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Offline Simon123

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Vacuum tube ok or not?
« on: November 16, 2013, 10:42:35 pm »
Hello!

I have gm5606 philips cro, and after looking ate the symphtoms i found one of these tubes is defective-left i think.
But i am not shure, it works just so there are voltages on the output, but it acts unstable, if i switch em aroun the other part of the circuit doesnt work.

So its little bit white on the top?
 

Offline G7PSK

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Re: Vacuum tube ok or not?
« Reply #1 on: November 16, 2013, 10:49:02 pm »
White on top usualy means that some air has leaked into the valve/tube. Check the filiment if not burnt out now it soon will be.
 

Offline AF6LJ

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Re: Vacuum tube ok or not?
« Reply #2 on: November 16, 2013, 10:56:05 pm »
As the poster above indicated the white on top indicates that gas is present in the tube.
Get another tube. :)
Sue AF6LJ
Test Equipment Addict, And Proud Of It.
 

Offline SeanB

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Re: Vacuum tube ok or not?
« Reply #3 on: November 17, 2013, 03:36:34 am »
It still has a good vacuum, but likely the heaters have lost emission and this means end of life. You can rejuvenate the heaters if you do not have another but best is to replace it with a NOS one.
 

Offline Simon123

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Re: Vacuum tube ok or not?
« Reply #4 on: November 17, 2013, 09:38:19 am »
Ok, thanks ill proably buy new one.
 


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