[SignalOne] Arcing in Final

Thu, 31 Oct 2002 20:38:27 -0500

John,

One source for the tube is
www.tubesandmore.com. 
$149.

73, Bob

W0YVA

At 01:19 PM 10/31/02 -0500, W2AGN wrote:

OK, this is driving me nuts! About
4 months ago I became the proud owner 

of a lovingly restored CX7A. It looks like new. First time I turned it

on...ka-pow, the 1 ohm resistor blew. Talking to the gentleman I bought

it from, it seems he had a simalr problem, and made some suggestions.

I found the {quot}collar{quot} on the tube loose, and the setscrew I
though might 

have been arcing. I tightened it up, and looked over the inside of the PA

with a magnifying glass. I could see no signs of arcing, so replaced the

1 ohm resistor.

All was fine, until after a month or so of no use, I fired it up the

other day. Ka-pow again. Sure enough, resistor was blown. This time I

replaced the ,005 3KV bypass. Turned it on, all seemed fine for about 5

minutes..then ka-pow again. Blew another 1 ohm resistor.

I can't see where it is arcing. I have a sinking feeling it might be the

tube arcing internally. 

Anyone had similar experience steer me where to look next? Also, 

suggestions as to where to purchase an 8072 for the final, at the best

price.

---

+-++-++-++-++-+   John L. Sielke
|W||2||A||G||N|       
http://www.w2agn.net

+-++-++-++-++-+    Ex-K3HLU,TF2WKT,W7JEF,W4MPC,N4JS
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