[Heathkit] Tubes

[Jim Shorney]

On Thu, 10 Nov 2011 10:52:47 -0500, Walt dabell wrote:

>I would be looking for larger tubes, something
>classic like an 807 or a 3-500Z, bad ones that still have the
>filament working. Or not. I want to use them for old-tech "candles"
>so speak.

The Eimac 250TH with the plate structure that looks like an alien city in a
bottle would look really cool, I think.

A word about "dark" 3-500Zs; a known failure mode is the filament pins
desoldering themselves from insufficient cooling. Resoldering them with good
high-temp solder could result in a perfectly good tube that will put out rated
power. Lots of info on the internet about this.

I wouldn't mind finding a genuinely bad 3-500 myself, for my display.

73

-Jim


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