[Milsurplus] Re metal tubes

[J. Forster]

Mike,

The metal tabs just hold the phenolic base/pin holder to the metal case.
There is a glass disk further up inside which is the wire-to-glass and
glass-to-case seal for the vacuum.

Best,
-John

==============


> Interesting, I will have to try that. All my previous experience has been
> that the inside of the metal shell is lined with glass, and, it is what
> gives it its hermetic seal. Most metal tubes also just have 4 tabs on the
> bottom part to attach them to the base, hardly enough to seal them. 73 -
> Mike
>
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
>
>
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Al Klase
> Sent: Thursday, February 18, 2010 10:06 AM
> To: milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] Re metal tubes
>
> On 2/17/2010 8:34 PM, jcoward5452 at aol.com wrote:
>> As you all know,inside that metal tube is a glass tube.The metal is for
>> RF
> and Noise shielding...........
>>
> Actually, that's not the case, except for some non-RCA products that
> were leveraging existing technology or ducking patent issues.  Just take
> a hack saw to an RCA metal tube, and you'll see what I mean.  The only
> glass is in the seals where the wires exit the tube.
>
> Al
>
> --
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
>
>
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