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

[Rich Post]

I have one that I whacked open due to a failed filament, wanting to re-use
it as an octal plug.  The bottom button was glass but not the rest.

Rich KB8TAD

On Wed, Sep 15, 2021 at 3:56 PM <frledda at att.net> wrote:

> All the metal tubes I opened, many years ago, had metal on glass!
>
>
>
> *From:* arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> *On
> Behalf Of *scottjohnson1
> *Sent:* Wednesday, September 15, 2021 2:53 PM
> *To:* William Cromwell <wrcromwell at gmail.com>; arc5 at mailman.qth.net
> *Subject:* Re: [ARC5] A little off-topic: Metal tubes (eg 6SJ7) seem
> quite valuable ...
>
>
>
> Not true, unless it is MG (metal- glass) tube.  The rust is just cosmetic.
>
>
>
>
>
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
>
>
>
>
>
> -------- Original message --------
>
> From: William Cromwell <wrcromwell at gmail.com>
>
> Date: 9/15/21 11:58 AM (GMT-07:00)
>
> To: arc5 at mailman.qth.net
>
> Subject: Re: [ARC5] A little off-topic: Metal tubes (eg 6SJ7) seem quite
> valuable ...
>
>
>
> Hi,
>
> A coupla things.
>
> I have used rusty tubes as-is successfully. Your mileage may vary.
>
> I have been lead to believe that inside that metal shell is a glass
> tube. The vacuum is not dependent on the integrity of the metal shell.
> Naybe somebody has contradictory information with citations.
>
> 73,
>
> Bill KU8H
>
> bark less - wag more
>
> On 9/15/21 2:10 PM, Leslie Smith wrote:
> > A link: https://www.ebay.com.au/itm/283973399609
> > <https://www.ebay.com.au/itm/283973399609>
> >
> > Makes the idea of polishing rusty tubes worth-while.
> >
> > Leslie
> >
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