[Boatanchors] Mercury Vapor Rectifier Lore Needed
jfor at quikus.com
Sat Oct 12 12:07:05 EDT 2013
RTVs other than clear have fillers of unknown properties. Not much UV
makes it through glass.
> Thanks all.
> This is thinking...red hitemp stuff from the auto parts store...I already
> have it!
> Will try.
> -----Original Message-----
> From: Fuqua, Bill L
> Sent: Saturday, October 12, 2013 10:37 AM
> To: jfor at quikus.com ; Wilson
> Cc: BOATANCHORS
> Subject: RE: [Boatanchors] Mercury Vapor Rectifier Lore Needed
> RTV does not shrink, it is sticks well and holds up to high
> However, with tubes like 866A's you may want to use something other than
> clear stuff.
> It can be affected by UV radiation. A black or red RTV could limit the
> penetration depth of
> the UV.
> Bill wa4lav
> From: Boatanchors [boatanchors-bounces at puck.nether.net] on behalf of J.
> Forster [jfor at quikus.com]
> Sent: Saturday, October 12, 2013 10:23 AM
> To: Wilson
> Cc: BOATANCHORS
> Subject: Re: [Boatanchors] Mercury Vapor Rectifier Lore Needed
> 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
>> 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
>> 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
>> 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
>> 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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