[AMRadio] RE: Testing Transmitting Tubes


Merz Donald S merz.ds at mellon.com
Wed Sep 22 17:22:06 EDT 2004


Yes, but there are practical issues. This is certainly not a speedy method. Changing tubes out of a working rig puts a good tube in jeopardy of a mis-handling accident. How are results interpreted for a single tube changed into a push-pull final? You have to keep a different transmitter around for each tube type that you want to test (hmmmm, maybe this is an advantage, not a disadvantage....). Etc. Etc.

I think a simple emission checker is more practical--certainly more flexible--and probably tells you just about everything you need to know. If you need to know more, THEN you put it n the rig.

73, Don Merz, N3RHT


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net]On Behalf Of Donald Chester
Sent: Tuesday, September 21, 2004 11:56 PM
To: amradio at mailman.qth.net; baswaplist at foothill.net;
glowbugs at piobaire.mines.uidaho.edu
Subject: RE: [AMRadio] RE: Testing Transmitting Tubes





I think the best method would be to try the tube in the final rf stage of a 
plate-modulated AM transmitter and see if it makes full power on modulation 
peaks, and shows good linearity on a trapezoid pattern.

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