I've noticed that one reason for melting solder on the filament pins in
3-500 tube has been the corrosion of pins and or sockets making a very small
narrow contact point where all the filament current must be drawn through.
This heats up the contact to a solder meting point.
This also accounts for why sometimes one tube fails to light up at turn on.
Where dust and bad air are prevalent, combined with age is where you will
see this more often.
Solutions include removing the tubes and cleaning both tube pins and
sockets. Rebending the socket contacts to increase tension on the tube pins
when inserted can help when socket contacts have spread a bit.
If this fails, new sockets are in order.
When cleaning pins/sockets, don't forget to reflow solder on the tube pins
73, Dan Magro W7RF, (President WARC 1999, member SCDXC, SCCC)
Manufacturers Rep & Distributor for HENRY Amplifiers.
www.radiodan.com <http://www.radiodan.com> ??? RFpower@radiodan.com
<mailto:RFpower@radiodan.com> A trip to our web site is worth the click!
> -----Original Message-----
> From: email@example.com [mailto:firstname.lastname@example.org]On
> Behalf Of Rich Measures
> Sent: Monday, February 22, 1999 10:42 AM
> To: email@example.com
> Subject: Re: [AMPS] 3-500Z chimneys
> >Cooling the seals is far more important than running
> >air past the glass. I also believe the coleman lantern
> >glass would not be best. There is good reason why
> >EIMAC chimneys curve in at the top...
> >73, Paul K7CW
> ? Melting solder from pins 1 and 5 is common on the 3k-A and 2k-4, both
> of which use air system sockets. Melting solder from pins 1 and 5 in a
> SB-220 is virtually unheard of provided that the fan bearings are oiled
> every two years. // Why does the Eimac heat dissipating anode
> connector have the fins going the wrong direction for Eimac air system
> >---Rich Measures <firstname.lastname@example.org> wrote:
> >> >
> >> >I have a need for several 3-500Z tube chimneys. Reportedly Coleman
> >> >globes can be used. Has anyone tried this?
> >> >
> >> Ä The 6" transverse-fan / split-chassis cooling method used in the
> >> SB-220 provides way mo' betta cooling How do I know this?: By
> >> comparing the color of the ink on the glass envelope after years of
> >> Rich...
> R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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