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

[frledda at att.net]

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 <mailto:wrcromwell at gmail.com> > 

Date: 9/15/21 11:58 AM (GMT-07:00) 

To: arc5 at mailman.qth.net <mailto: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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