[Boatanchors] Broken tube cap repairs

[Gerry Steffens]

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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