[Boatanchors] Broken tube cap repairs

[J. Forster]

The makers used a ceramic cement, likely made by Sauereisen (???). There are
also special glues used for repairing porcelain and glass (cups, saucers and
teapots). If you find one of those, they'd likely work. You do not want to use a
super strong glue, because you could crack the glass seal. Epoxy will soften as
previously noted.

Another possibility is RTV silicone rubber.

-John

Gerry Steffens wrote:

> I don't know what the experts do, but I have been using cyanoacrylate
> (C5H5NO2, for you chemistry buffs) based glue (Super Glue) for that purpose
> successfully for years.  Horizontal output on old TVs to any of my multitude
> of old radios in the collection have worked just fine.
>
> The process I use is to clean out the cap, straighten the wire, glue the cap
> to the tube and then solder the cap connection.
>
> Good luck and cheers from Minnesota,
>
> Gerry
>
> Collecting & Restoring E.H. Scott,
> McMurdo Silver, Hallicrafters, Zenith
> Transoceanic and any other interesting
> radios since the 1960s
> Gerald Steffens P.E.
> Oronoco, MN
>
> Collection stands around 278 radios, 3 1/2 Oldsmobiles, 1 Eldorado, 3
> Suzukis, 1 1950 GMC 1/2 ton plus couple of everyday drivers and growing
>
> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net
> [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Bill Abate
> Sent: Wednesday, March 09, 2005 9:38 PM
> To: boatanchors_list
> Subject: [Boatanchors] Broken tube cap repairs
>
> One of my 811A's in my 30L-1 had its plate cap separated from the wire.
>   I was able to resolder the plate cap to the wire.  I used 2% silver
> solder as I thought that would be a little better.  But now I have to
> secure the plate cap to the glass envelope.  I thought about using epoxy
> or Monster glue but most glues and epoxies soften with heat.
>
> Anybody have experience with this problem?  Strangely the tube is still
> good!  Operating a triode with full drive but without plate voltage
> should have destroyed it.  At least I think so but obviously I am wrong.
>
> 73,
>
> Bill, K3PGB
>
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