[R-390] Roll Call (Rodger)

[Roger Ruszkowski]

Roger,

You unhook the slug rack springs from the slug rack.
Be carful you do not let the springs drop under the RF deck.
In the bottom of the slug tube is a small bolt that secures the transformer can to the RF deck.
Once you have this screw loose you can unplug the transformer can with the stuck trimmer.
You then push the frame tabs in a bit and slide the transformer can cover off the frame.
The trimmer has a clip that holds the trimmer cap top in place.
You can nudge this clip aside to release the top of the trimmer cap.
A bit of force on the center pin and the top of the trimmer will pop up.
You can set the transformer frame up side down in some alcohol to soak
the stuck parts apart.
Wipe everything clean and reassemble.
 
Roger AI4NI
 
 
-----Original Message-----
From: Rodger Adams via R-390 <r-390 at mailman.qth.net>
To: r-390 <r-390 at mailman.qth.net>
Sent: Tue, Dec 15, 2015 4:32 pm
Subject: Re: [R-390] Roll Call (Rodger)

Hello All R-390 fans,Glad to see there’s some activity here.  I’ve been reading the list for a while.  I’m 55, and got my Collins R-390 (non-A) about 32 years ago for $200.  It was working at the time but has been in my attic for the last 20 years.  Finally had some room to bring it into the house so fired it up a few months ago.  It was mostly working but did need some TLC.  I replaced all 8 47 ohm cathode resistors in the rectifier and regulator circuits.  Also replaced most of the RF and IF tubes and the 6BH6 amp tube in the regulator circuit.  One of the biggest problems was with the diode load jumper on the back panel.  It was a couple of lugs crimped onto a solid copper wire.  The crimps had gotten corroded over the years so replacing the jumper with a soldered one made major improvements.  Also had a loose/dirty BNC between the RF and IF decks.  I still think the band switch probably needs some cleaning but not sure I want to remove the RF deck at this point to get to it.I have 3 RF deck transformers with stuck trimmers.  Does anyone have any thoughts on how to unstick them?  I certainly don’t want to risk breaking them.  I’ve collected a few spare parts and subassemblies but would love to pick up an RF deck and IF deck.Anyway, just saying hello and introducing myself to the list.  I’m not an expert by any means, but glad to help out others in any way I can.Thanks and 73,Rodger (WB4HIR)    ______________________________________________________________R-390 mailing listHome: http://mailman.qth.net/mailman/listinfo/r-390Help: http://mailman.qth.net/mmfaq.htmPost: mailto:R-390 at mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html