On 04/28/2014 04:47 PM, Matthew Smith wrote:
> Quoth Tidak Ada at 2014-04-29 06:13 ...
>> I once opened a 50 cm B/W picture tube to make a lamp of it. I carefully
>> packed the tube in thick blankets and then filed off the exhaust nipple.
>> About one minute of hissing and the pressure was equilibrated. No danger
>> at all!
> 
> Aha! I wanted to get the electron gun and base of a CRT, to re-mount
> into a longer accelerator structure - was wondering how to break the
> vacuum safely.

That works but it pretty much destroys the evacuation port for future
use.  I have the same intentions and have collected several B/W guns.
My technique is to use a dental turbine (a dremel will do) and bore an
about half mm hole through the neck downstream of where I plan on
cutting it.  That way I can re-open the tubulation in a controlled
manner and reuse it.

John


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