On Mon, 22 Feb 1999 18:06:35 -0800 "Radiodan W7RF" <RFpower@radiodan.com>
writes:
>
>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.
Corrosion requires moisture or another chemical compound to activate.
Not something one would find in many ham shacks.
IOTH, what looks like corrosion may be simply a result of poor contact
tension and subsequent overheating, melted solder, etc. This is quite
common in Henry amps using the Eimac socket which does not have a tension
spring/clamp. Repair does not usually require spending money. Simply swap
out the filament pins with 2 of the grid pins. Clean up the bad pins,
retension and use as grid pins; if they are really bad, acid dip and tin.
Amps using the Johnson socket can be easily repaired by drilling out the
rivets and swapping contacts. Use brass or stainless hardware to
reassemble. Retensioning a overheated pin will usally work just fine in a
low current grid application.
73 Carl KM1H
President of nothing.
Amplifier repair ideas without mfg rip-offs
>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
>if needed.
>
>
>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: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
>> Behalf Of Rich Measures
>> Sent: Monday, February 22, 1999 10:42 AM
>> To: amps@contesting.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
>> sockets?
>> >
>> >
>> >---Rich Measures <measures@vc.net> wrote:
>> >>
>> >>
>> >>
>> >>
>> >> >
>> >> >I have a need for several 3-500Z tube chimneys. Reportedly
>Coleman
>> >lantern
>> >> >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
>> >use.
>> >>
>> >>
>> >> Rich...
>>
>>
>>
>> Rich...
>>
>> R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
>>
>>
>> --
>> FAQ on WWW: http://www.contesting.com/ampfaq.html
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>>
>>
>
>
>--
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>
>
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