[SignalOne] CX7A Arcing Update

Mon, 11 Nov 2002 08:07:53 +0100

Hi,

try RF Parts for replacement transistors. They are very well equipped.

73 Uli, DK4SX

-----Original Message-----
From: W2AGN [mailto:[email protected]]
Sent: Samstag, 9. November 2002 18:09
To: [email protected]
Subject: [SignalOne] CX7A Arcing Update

First, let me thank all of you who replied. Lots of good info. I have 
stored several messages in my "Saved" box.

I got a replacement tube today. Installed it, and let it "cook" for an 
hour. Viola! NO arcing when I hit the B+. 

Bad news :-(  I have no drive. Someone suggested the arcing might blow 
the driver transistor, and I guess it did. 

Jsut to check, I put the old tube back, and sure enough, it arced, and 
the 1 ohm blew. So it WAS the tube. (It would arc with no drive before). 
Put back new tube, replaced 1 ohm resistor, and all OK again.

Now,

1. Where is a good place to get replacement driver transistors?
2. Any hints on the easiest way to get at the thing. Looks like I have to 
remove the driver board, which means removing the readout board, etc. 
Correct?

---
+-++-++-++-++-+   John L. Sielke
|W||2||A||G||N|        http://www.w2agn.net [UPDATED]
+-++-++-++-++-+    Ex-K3HLU,TF2WKT,W7JEF,W4MPC,N4JS
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