[Boatanchors] Mercury Vapor Rectifier Lore Needed
jfor at quikus.com
Sat Oct 12 10:23:49 EDT 2013
I've posted before you should not use epoxy or superglue on tube bases.
You should use euther:
A Sauereisen cement (which is what was originally used, I thnk)
Clear, unfilled RTV
Possibly Gorilla glue.
> Iâve been resurrecting some gear with 866s in it, and Wonder about some
> of the things Iâm seeing.
> Iâve used 866s all my life, but never thought much about them, except
> good or bad.
> Some have much more glow than others, and the more glow the whiter. Is
> this because of air getting in?
> Some have what looks like shards of metallic stuff on the glass. Is this
> a coating off the plate?
> Last night, I had one that glowed pretty white, but also had a neat ring
> of fire dancing around the anode, with fingers pointing outward. What was
> going on there?
> Sometimes one will are over inside and blow fuses, etc. How can that
> happen, if the plate and filament are not out of position?
> I recently had a big flash from the back of the rack, accompanied by a
> colossal bang, as loud as a .22 LR shot!
> I looked all over the PS for evidence of arcing, but didnât find any.
> Later, I took hold of the 866 to take it out and the whole bulb came off
> in my hand!
> It broke perfectly cleanly, right around where it went into the base.
> This has now happened twice and Iâve never seen it before.
> Both these tubes were loose in their bases, so I shot in some superglue to
> hold them.
> Could it be that the superglue bound them so tightly to the bases that
> they couldnât expand and broke from stress concentration?
> Or could it have been that the superglue caused a thermal stress
> concentration in the class.
> Anyone ever see one break this way?
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