Valves

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BeJay
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Valves

Post by BeJay » Sun Aug 02, 2015 4:52 pm

Pop Quiz. Does anyone know why the valve on the left is not working?

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parkview
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Re: Valves

Post by parkview » Mon Aug 03, 2015 10:38 pm

1) It's not plugged in? But that's too obvious :lol:
2) no getter. Manufacturing missed the getter phase, so too much bad gas still inside?

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BeJay
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Re: Valves

Post by BeJay » Fri Aug 07, 2015 7:28 am

It just leaked in some air through the not quite sealed tip over time.
The getter has been flashed, but it's contents has been recombined with air and left a tiny skim of titanium oxide, where it flashed onto the glass. This is in a 50 year old radio gram that otherwise works fine. I'm trying to source a new tube which is a 6an7/A or a ech80 equivalent.

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I had a few leaky paper wax caps, but replaced them and all is good there.

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All made in Australia.

DylanM
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Re: Valves

Post by DylanM » Tue Oct 13, 2015 8:44 pm

What are these? :o
I know everything about nothing.

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seaton
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Re: Valves

Post by seaton » Wed Oct 14, 2015 11:24 am

DylanM wrote:What are these? :o


Think of them as transistors before there were transistors.

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