[SignalOne] Continiuing Travails

Mon, 13 Jan 2003 10:12:46 +0100

The arcing of the final tube - especially in the case of a new substitute - is not a matter of drive but of self oscillation. To avoid self oscillation the anode R/L combination has to be remodeled, another R/L-combination inserted into the grid/cathode drive, a feedback has to be evaluated and the grid/ground connection modified. All other measures cure the effects but not the cause.

73 Uli, DK4SX

-----Original Message-----
From: W2AGN [mailto:[email protected]]
Sent: Sonntag, 5. Januar 2003 19:49
To: [email protected]
Subject: [SignalOne] Continiuing Travails

Well, I replaced the IC1 on the driver board now. That makes about 
everything. Actually measured to output to the final grid and have in 
excess of 50V...still no indication of drive.

SO, I replaced the "new" final tube that I put in after the arcing 
problem with the original with another "new" tube I purchased from 
someone on line. Turned her on and....KAPOW!! arcing again! Put other 
tube back..no arc, no drive, put in new tube, BAM, arc, zap.

Am within one day of putting this thing on Ebay......

---
+-++-++-++-++-+   John L. Sielke
|W||2||A||G||N|        http://www.w2agn.net [UPDATED]
+-++-++-++-++-+    Ex-K3HLU,TF2WKT,W7JEF,W4MPC,N4JS
_______________________________________________
SignalOne mailing list
[email protected]
http://mailman.qth.net/mailman/listinfo/signalone