[R-390] RF subchassis separation

[Bill Kulze]

Of course, maybe you're talking about the xtal for that osc. If so, never mind!

Bill

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Bill Kulze
Sent: Thursday, March 13, 2014 3:38 PM
To: R-390 at mailman.qth.net
Subject: Re: [R-390] RF subchassis separation

Now, I haven't messed with my radio or looked at the manual in a while, but wouldn't a total loss of everything below 8MHz indicate a problem with the oscillator associated with the third conversion for everything from there down, or something in that neighborhood? A single crystal would only take out the one, or in this case, two 1MHz bands associated with the xtal? Like I said, it's been a while, maybe I'm remembering it wrong.

Bill
W2NVD

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Mark Richards
Sent: Thursday, March 13, 2014 1:05 PM
Cc: r-390 at mailman.qth.net
Subject: Re: [R-390] RF subchassis separation

Removal of the entire RF and Crystal Oscillator section was a lot easier than it first appears.  Simply a few green-headed screws, remove some cabling, and it comes out as an entire unit.  It looked intimidating, which caused me to believe that it was... like a schoolyard bully.

Now that the RF deck is removed I was able to clean up the bandswitch, replace a few capacitors, and poke around in the crystal oscillator section.. as mine doesn't work properly.  No issues found in that area (with components that are testable in circuit); no signs of overheating or stress.  So it's either tube/s or crystal.

Question A: As I keep hearing crystal replacement as the answer to this problem, can someone here lead me to a source?

I should probably replace the pair.  Test revealed that < 8MHz I have no radio.. so likely the other crystal gave up, too.

Decided not to disassemble any further, as in repairing the loose shaft 
that started this whole mess.   It works mechanically.  Why fix it.. 
unless I want perfect stock appearance perfection, which I am less inclined towards after all this work.

Went about removing each of the slugs to be certain I had not mixed these up and managed to snap two of them.  Easy to do as they are old and seem quite brittle.

Question B: Is the best fix a dab of epoxy?  Looks as if it cannot be soldered together...

/K1MGY

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