[R-390] Cleaning tube sockets
Barry Hauser
barry at hausernet.com
Sun May 28 14:21:55 EDT 2006
Hi Dave
If you haven't done so already -- freshen up the solder joints on all the
pins on that socket. The solder can look good on the outside, but the joint
may have impurities on the inside -- which I learned on this list can
result in very long term degradation. (i.e. was not a cold solder joint to
start with)
If it's the pins themselves, good ol' Deoxit is the thing to try first. Put
a few drops of D5 in the socket terminals and coat the tube pins -- then
insert/remove a few times and see if that cures it.
The terminals may have lost their grip - - often due to from pluggin in
tubes with bent pins. (Never use a socket as a pin straightener.) You can
try either using something like a dental pick to coax the terminal closed a
bit -- or an old TV-tube jockey's trick -- bend the two pins on the tube a
bit to establish contact. All that fails -- it's socket replacement time.
Hope this helps.
Barry
----- Original Message -----
From: "Dave Maples" <dsmaples at comcast.net>
To: <r-390 at mailman.qth.net>
Sent: Sunday, May 28, 2006 12:55 PM
Subject: [R-390] Cleaning tube sockets
> All: As is always the case, this group is absolutely invaluable in their
> insight. I've got another question.
>
> I am repairing another R-390A for another fellow, and have run into TWO
> tube
> sockets in the IF deck that seem to have "intermittent" pins. Everything
> is
> soldered; the receiver has sat for so long unattended, though, that the
> pins
> themselves seem to have oxidized.
>
> Suggestions? Is there something I can use to gently clean the contacts in
> the tube sockets?
>
> Thanks,
> Dave WB4FUR
>
>
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