[R-390] Hosing those 390A, a short pictorial

Bill Hawkins bill at iaxs.net
Sun Mar 19 13:44:17 EST 2006


Fernando,

It's been my experience that spraying detergent just irritates the
dirt without removing it. You need a soft bristle brush to break it
loose. Soft bristles so you don't break any wires. Detergent is
pretty good at removing the identification from the tubes.

Any detergent or even hard water can leave a conductive residue.
Tektronix service people used to wash the big scopes with detergent
and then follow with a distilled water rinse. The conductive residue
can drop the Q of coils or change the value of trimmer caps.

It might not be too late to rinse, but once hard water deposits dry,
they're hard to remove. Don't allow water to sit around after you
rinse. Use canned or compressed air to blow water out of sockets
and other places it can get into, then leave it to dry.

I've washed and rinsed many Tek scopes and other pieces of test
equipment. They always worked fine afterwards. Never tried to wash
a 390 class radio, though.

Bill Hawkins


-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of Fernando Quinones
N2FQ
Sent: Sunday, March 19, 2006 11:23 AM
To: r-390 at mailman.qth.net
Subject: [R-390] Hosing those 390A, a short pictorial


Hello to all.

Awhile back I posted a picture of my R-90A's in a rack, which all  
needed a good cleaning.
So.. after reading previous posts here as to how go about it, I  
decided what someone
suggested but never shown, that is to  hosed them down.

I used Simple Green and a water hose, perhaps I committed HariKari.
Here are some pictures for your enjoyment.

< http://pages.sbcglobal.net/nf6q/R-390A's/R-390A's.html >

Oh.. the darn thing are to heavy for my oven self, so they are  
bathing in the California Sun. hi

While I'm at it, let make a plug now. To subsidize the rebuild of two  
of my keepers,
I'm selling two R-390As (Collins), one with engrave panel and the  
other with decals,
they both work by the way, as well as the SSB Adapter ( never plug in  
so don't know if it works or not, but all there).

Please contact me off list if interested.

Fernando  N2FQ
<http://pages.sbcglobal.net/n2fq>



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