[R-390] Gettering old tubes

[Renee K6FSB]

We still use oil diffusion pumps on implant machines.....however turbo 
pumps are nicer and no mess when someone goofs on manual pump 
downs......I keep a roughing pump for when i need a reasonable "soft" 
vacuum like pull "air" from potting compounds........
Renée, K6FSB

Richard Loken wrote:
> On Thu, 3 Mar 2011, 2002tii wrote:
>
>   
>> Bottom line, with receiving tubes a few days of any treatment that
>> doesn't melt the glass can't do anything useful about gas.
>>     
>
> Well we could store the tubes in a vacuum.
>
> Back when I was young and strong they used oil diffusion pumps to pull a 
> hard vacuum but now they use something else.  Keep on the lookout for a 
> scrapped 60 year old electron microscope and a suitable large, strong, and 
> sealable container.  Hook the vacuum pump and the diffusion pump out of the 
> electron microscope to your big steel bottle, stash it beside the chest 
> freezer in the basement, fill it full of tubes, and pump out the air.
>
> I will get a man right on that task.
>
>