[SignalOne] CX-7 Display

[Singley, Rodger]

Ed,

Thanks!  

I plan to stay with the Nixie tubes for this unit if possible.  I have one spare tube and thank you very much for the hint about Mouser concerning the display driver ICs.  I missed the part on the first search but then found the NTE equivalent and ordered a few for spares.  I have a feeling a lot of these legacy parts will soon be no longer available from any of the standard supply houses since it isn't worth making RoHS compliant versions.

I picked this one up at the Peoria hamfest last year and I am glad to have it operational.  During checkout of my Alpha 274 amp I found the electronic bias switching isn't working so it is now on the bench and hopefully will be pretty easy to repair.  It certainly is much less involved than the CX-7A. 

We aren't far away from each other so chances are very good you will hear this one on the air.  I spend a lot of time operating vintage AM and CW with a Johnson Ranger/Desk KW and Viking 500 but I have been getting more involved with some of the vintage SSB gear.

73, Rodger WQ9E



-----Original Message-----
From: signalone-bounces at mailman.qth.net on behalf of EDWARD SCHUMACHER
Sent: Sun 3/14/2010 5:08 PM
To: SignalOne at mailman.qth.net
Subject: [SignalOne] CX-7 Display
 


This list is for discussions regarding collecting, repair, use and sale of Signal/One radios and accessories. 

Documentation on Signal/One radios can be found at http://www.hamanuals.com and several other sites on the Web. 
 
.
Congrats on finally acquiring your Signal One, Rodger! I too ended up with one a few years back, from the estate of one of the old DX'ers from my first radio club no less. Be advised, changing the display to LED's will require adding a resistor to stabilize the power supply because the nixies provide a continuous load for the 300v supply. See the archived newsletters for the details. 

I had some minor troubles with mine due to something having been spilled into the display board that left dried residue under the ic's. I had to lift each one, clean the socket and the reinsert the IC. This was when I found the corroded off lead on one of the driver ic's. The good news is that Mouser still has the chips and they are cheap! I also lucked out bigtime on my one and only trip to Dayton year before last and found a guy with a small box of nixies that turned out to be the correct ones for the CX-7 and also very reasonably priced. I could not believe finding what I thought would be next to impossible from my wish list for spare stuff for the rig. I got several so you can bet I will probably not need them, HI!

I was very fortunate in that my rig had been well cared for and had none of the issues with the PTO's but some of the other things I had to solve more than made up for it. At least I finally upgraded some of my bench equipment so I guess that's good. Hope to hear your rig on the air one of these days.

73 ... Ed, WA9GQK



      
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