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[Amps] Checking 12by7

To: <amps@contesting.com>
Subject: [Amps] Checking 12by7
From: 2 at vc.net (2)
Date: Sat Apr 12 08:47:11 2003

>In a message dated 4/11/2003 8:19:42 AM Pacific Daylight Time, 
>4z4tl@iarc.org 
>writes:
>
>> Is there a way to determine if a 12by7 is operative , out-of-circuit
>> (resistance checks) ?
>> 
>
>In my many years of vacuum tube service, the only true test is substitution 
>with a known good tube
>K6KWQ

?  Quite true, but a precursory check with a high-potential tester can 
prevent a tube with a problem from being tried in and damaging the 
amplifier. 

-  R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, 
www.vcnet.com/measures.  
end


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