[Heathkit] SB-220 socket question

[jeremy-ca]

Eimac formally approved the Heath cooling design and the flow requirements 
and tube orientation were published on later tube sheets.

Carl
KM1H


----- Original Message ----- 
From: "Mike McCarthy, W1NR" <mike at w1nr.net>
To: "'Levert'" <ka9cch at arrl.net>; <heathkit at mailman.qth.net>
Sent: Sunday, August 27, 2006 7:41 AM
Subject: RE: [Heathkit] SB-220 socket question


>I am assuming that they consider the SB220 socket and cooling design to be
> defective and do not cover filament pins desoldering themselves.  This can
> happen (it's happened to me) when the fan starts to go or the sockets are
> not installed with the correct pin alignment.  If enough air does not get
> circulated past the filament pins, they overheat and the solder in the 
> tube
> pins falls out.
>
> Mike, W1NR
>
>
> -----Original Message-----
> From: heathkit-bounces at mailman.qth.net
> [mailto:heathkit-bounces at mailman.qth.net] On Behalf Of Levert
> Sent: Saturday, August 26, 2006 7:30 PM
> To: heathkit at mailman.qth.net
> Subject: [Heathkit] SB-220 socket question
>
> Is there a problem with  SB-220 tube sockets?  I found this note in the
> warranty info on the RF Parts web site
>
> "Tube Pin Heating or desoldering resulting from defective sockets (i.e.
> SB220) are not considered a warranty item. We recommend examination of
> original tubes for signs of this problem."
>
>
> What are the indicators of defective sockets and is it just better to
> routinely replace these 30 yr. old sockets rather than risk the tubes??
>
> Thanks
> KA9CCH
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