tubes age 57
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Date: Mon, 22 Jan 2001 11:34:21 -0800
Subject: [R-390] Re: greetings de dd8bd
>Roger, what does "zippo" mean (could be in German something like
>"Rei_verschlu_")? Is it a certain type of tube shield ? Or some type of coile
>around the tube, I saw somewhere ?
Before the wonderful day of throw away lighters and when smoking was
fashionable, one use to have a lighter that was "refillable" with lighter fluid and
flints. A popular (wind proof) model was a brand name Zippo.
Now back to blue tubes (gassy). Blue, or gassy or noisy ( not yet showing blue
under its current operating conditions) tubes can be helped by roasting them at
low heat ( over a Zippo lighter). This heats the stuff in the getter and thus will
pull a bit more of the gas out of the tube envelope and trap it in the getter
material. Strange as it may be, placing the tube in a tube tester and running the
filament voltage up to double or triple voltage just does not have the same
effect as roasting the tube over low heat. Do be careful. You can apply too much
heat to fast and crack the glass. I have also over heated a tube to red glass and
had it melt into the tube elements. Heat the tubes from the top while holding the
pins.
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Date: Wed, 24 Jan 2001 06:07:20 -0600
Subject: Re: [R-390] Re: gassy tubes
>Now back to blue tubes (gassy). Blue, or gassy or noisy..............
I've used this method many times for gassy tubes. The Zippo works a lot better
than a butane lighter. I suspect that it's got something to do with the soot
helping to prevent hot spots in the glass. I've found that it's a lot easier to crack
the glass envelope with a butane lighter.
>Strange as it may be, placing the tube in a tube tester and running the
>filament voltage up to double or triple voltage .....................
Correct. You have to be able to play the flame over the getter I tried an
experiment last year involving a 6" lens and sunlight that failed. I was hoping
that I could heat the getter from the "backside" with the concentrated sunlight. It
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