[ARC5] A little off-topic: Metal tubes (eg 6SJ7) seem quite valuable ...

[William Cromwell]

Hi,

Looking at the replies regarding glass tubes in metal sleeves it seems 
that some are and others are not. Maybe most are not. I doubt anybody 
here has any reason to report other than their experiences opening metal 
tubes. I may have read some "fake news" once upon a time:)

I was never interested enough to do a post-mortem on dead metal tubes. 
Tubes that work should not be 'molested'. I did harvest a few octal 
plugs from dead glass tubes. Low hanging fruit you know.

73,

Bill KU8H

bark less - wag more

On 9/15/21 4:48 PM, Ben Hall wrote:
> On 9/15/2021 3:24 PM, Tom Lee wrote:
>> My experience is the same as yours. I’ve opened several over the
>> years, and I’ve never seen one that was simply a metal covering over
>> an otherwise glass tube.
> Greetings all,
>
> Years ago I obtained a large quantity of assorted tubes - all just 
> thrown into cardboard boxes - all of questionable provenance. After 
> sorting them out, I had about 30 metal octals that were rusty and 
> unidentifiable.  I try not to waste anything, so I cut them all apart 
> to salvage the octal bases.  (for what?  I don't know...but I will say 
> I've made a few of them into test adapters, etc...)
>
> Every single one had a glass seal between the octal base and the metal 
> envelope, but in all of them, there was no further glass. They were 
> not glass tubes in metal sleeves; once past the glass seal, the metal 
> envelope was what held the vacuum.  :)
>
> Thanks much and 73,
> ben, kd5byb
>
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