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Subject:
Failing tube symtom
From:
Michael Ryan <[log in to unmask]>
Reply To:
For blind ham radio operators <[log in to unmask]>
Date:
Sat, 11 Apr 2015 10:16:12 -0230
Content-Type:
text/plain
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text/plain (14 lines) 
Hi all: 

What are the clear symptoms of failing tubes? 
Is 1 of them when you have your plate and load adjusted for initial max output and each time after that, the output gets less and less? 
Will a tube just go like a light bulb, 1 minute you got full output then boom, no output? 
I'm thinking once again about my fuse blowing issue and according to NC4L, the 102 guy in FLA, 
this is a sign of failing tubes because of miss tuning or too long key down in the tune up cycles. 
He calls it thermal run away and it contaminates the screens and deforms them. 
The only way to fix this is with a new set of tubes, which I have. 
Well not brand new but a good set of backups. 

73: 
Michael DE VO1AX

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