[Amps] bangs in 3cx800

[2]

>>that uses a pair 3cx800. About a minute or so after I first turned it on 
>>[nothing hooked to it but the power cord] I heard a very loud bang. So I 
>>shut if off and inspected for damage. Nothing found.
>> 
>>While reading the manual imagine my surprise to see the bang 
>>mentioned, said to not be that uncommon, and not to worry about it unless it 
>>starts happening often--then replace the tube.
>
>	I'm an appliance operator, here to learn ... but I can't help commenting
>on the above. What kind of an amp manufacturer says "It'll bang sometimes
>when you turn it on; if it happens a lot, replace the $350 tube."?

**  On p.14, Kenwood's TL-922 manual talks about "normal arcing" in the 
tank.  Those with access to a spectrum analyzer know that  normal arcing 
and bangs coincide with a signal intermittently being generated at c. 
120MHz.  If not corrected, "normal arcing" will eventually destroy the 
5kV SagadenkiŽ bandswitch and/or cause grid/fil shorts.  

>Apparently the answer to that is Ameritron. Is this a common practice??
>
**  Not Invented Here syndrome is undoubtedly a common practice.  

>	My ACOM 1000 manual certainly says no such thing ... nor does the amp make
>any noises at all.
>
As I understand it, ACOM does not use High-VHF-Q parasitic suppressors.  

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