[Amps] Checking 12by7

[2]

>In a message dated 4/11/2003 8:19:42 AM Pacific Daylight Time, 
>4z4tl at 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