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Old 1st May 2013, 03:16 PM   #1
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Default Flash getter question

Hi all

I recently acquired some ostensibly NOS tubes for a good price. I have a question about a pair of Haltron EL84s from the batch. They have a large amount of what looks like flash getter on the walls of the tube, in addition to the normal amount at the top. Around half the side area is mirrored with the stuff.

Is this a sign of a lot of use, or is it simply typical for this particular tube's manufacturing process?

Looking in at one of the clear patches:
Click the image to open in full size.

Looking at one of the flash patches:
Click the image to open in full size.

They sound fine, but I paid for unused tubes - would just like to know if I got my money's worth
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Old 1st May 2013, 05:09 PM   #2
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Hi!

Some manufacturers applied the getter on the top, some at the side some at both. A shiny getter is a sign of a good, healthy tube. With use, the shiny area becomes less and can completely disappear.

So your tubes seem fine. Nothing to worry about

Thomas
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Old 1st May 2013, 05:24 PM   #3
DF96 is offline DF96  England
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Some valves (possibly from Eastern Europe?) seem to have extra silvering which may be associated with the cathode activation process. I have a few RF pentodes which have that.
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Old 1st May 2013, 06:11 PM   #4
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Quote:
Originally Posted by DF96 View Post
Some valves (possibly from Eastern Europe?) seem to have extra silvering which may be associated with the cathode activation process. I have a few RF pentodes which have that.
I also have seen this with small signal pentodes. Namely, 'Pinnacle' labeled EF184 / 6EJ7.

Rundmaus
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Old 1st May 2013, 07:06 PM   #5
DF96 is offline DF96  England
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Actually, mine may have been EF184 too (or EF89?). For some reason I suspect they were made in Poland, but I can't remember why I thought that.
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Old 1st May 2013, 10:51 PM   #6
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Excellent, thanks you very much for the information everyone . Good to know.
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Old 1st May 2013, 11:40 PM   #7
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They have round anodes with the side silver concentrated around the two round windows on each side of the anode, right?
I had these long ago, and served me well in my first guitar amp. High voltage, power set to '11' to compete with a loud drummer ).
When one of them broke, the top getter turned white quickly, where the side 'getter' remained silver for months! Different stuff.

Last edited by Parafeed813; 1st May 2013 at 11:41 PM. Reason: typos
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