[R-390] Some progress

Sun, 05 Jan 2003 12:17:56 -0500

Hi,

There are several answers about what they are doing with aluminum wire.

1) The connector has to be designed for aluminum wire. Most of what we used
down here wasn't.
2) You have to use goop on the wire with some of the connectors. Again
something we forgot.
3) Avoid salt air and moisture in general. How they handle this I have no
idea.

On a 390 the aluminum chassis connections are another good reason to avoid
the dunk and wash approach to cleaning. It is pretty common to tear a R-390
module apart and find white stuff caked up between steel and aluminum. If
the rot gets too bad the aluminum is pitted. The only answer seems to be to
keep them dry. I suspect that if you find the white stuff piled up on the
module mounts it would be a *very* good idea to do a screw re-tighten job on
the whole module.

    Take Care!

        Bob Camp
        KB8TQ

----- Original Message -----
From: "Jim Brannigan" <[email protected]>
To: "polaraligned" <[email protected]>; "R-390 list"
<[email protected]>
Sent: Sunday, January 05, 2003 11:55 AM
Subject: Re: [R-390] Some progress

> I agree,  and I tighten all screws on the chassis, particularly the tube
> socket screws.  This causes the washers to bite into the aluminum.
>
> There is no aluminum wiring in my house.  Many a homeowner has gone
through
> an expensive rewiring to correct the problems with aluminum.
>
> The Canadians like aluminum wiring.  I have a friend in Toronto who claims
> zero problems with aluminum.  I don't know what they are doing up there,
but
> it seems to work for them.
>
> Jim
>
>
> > I think it is a good idea also to address all the ground
> > connections while you are servicing each module.  The
> > chassis, being make of aluminum, oxidizes and makes
> > poor connections.  I loosen up the ground and clean
> > the connection point then use Ox-guard- or other  aluminum
> > electrical connection compound.
> >  Use of a compound for aluminum electrical wiring is a must, and
aluminum
> > house wiring has a very high failure
> > rate because of the oxidation of the wiring.
> >
> > Scott
> >
> >
> >
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "Jim Brannigan" <[email protected]>
> > To: "R-390 list" <[email protected]>
> > Sent: Friday, January 03, 2003 5:24 PM
> > Subject: [R-390] Some progress
> >
> >
> > > So far....
> > >
> > > I cleaned the front panel and knobs...
> > > Did a partial re-cap of the IF and audio decks...
> > > De-oxit all tube sockets, switches and connectors.
> > > tracked and graphed the PTO.  It is off 6.5 KC end-to-end, but pretty
> > linear
> > > at the 100kc points.
> > > (I'll set the end points later)
> > > Pulled the front panel.
> > >   I had a can of Radio Shack degreaser( the one with the tube and
brush
> at
> > > the end).  It made short work of the gunk on the gears.  The bad news
is
> > > that RS no longer stocks the stuff and in three store visits I could
> only
> > > find one more can.
> > >
> > > Pulled the RF deck....
> > >
> > > More to come
> > >
> > > Jim
> > >
> > > _______________________________________________
> > > R-390 mailing list
> > > [email protected]
> > > http://mailman.qth.net/mailman/listinfo/r-390
> >
>
> _______________________________________________
> R-390 mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/r-390
>
>