[Amps] 3-500Z grid short question

Rex Lint rex at lint.mv.com
Tue Feb 9 10:38:38 PST 2010


Steve,

See the tool at
http://lists.contesting.com/archives//cgi-bin/namazu.cgi?idxname=Amps
and you can search the AMPS archives yourself!

Best,

      -Rex-
 
     K1HI
       Rex Lint
       Merrimack, NH 


-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Steve
Sent: Tuesday, February 09, 2010 11:15 AM
To: amps at contesting.com
Subject: [Amps] 3-500Z grid short question

I'm looking at a TL922 for a friend. One tube has a grid - filament 
short, the same tube has an overheated filament pin. The solder has 
obviously reflowed at some point but hasn't totally run out of the pin.

Might there be a link between the two? I can't think of anything  obvious.

Friend didn't notice anything specific happen - he tuned up normally on 
20m, then next time he came to transmit there was no rf out and 
continuous standing current. He's had the amp for many years and uses it 
occasionally rather than continuously. Years ago one of the original 
Eimac tubes went with a bang and took out one grid choke. After repair, 
Chinese tubes went in. This time there's no sign of any damaged 
components and the grid chokes are intact.

I know this amp and this problem has occupied a lot of space here (I've 
been a subscriber long enough to have seen plenty of it). Please, let's 
not reignite any old wars.

Steve  G8GSQ
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