[AMPS] SB-220: Operate/Standby Switch

[measures]

>
>> > I don't believe its an issue of filamant "failure" or tube returns
>> > but one of reduced emission life.  The addition of a simple rheostat
>> > to the power tube's filament circuit makes good engineering and
>> > economic sense.
>> >
>> > -Paul, W9AC
>> 
>> Amen, Paul.
>> We are prolonging emisson here. An added bonus of a resistor/rheostat
>> in the primary of the filament transformer is a bit of inrush
>> protection that is there all the time.
>
>Put all those tubes laying around that are perfectly good except for 
>low emission in one pile. 
>
gold-sputtering reduces emission.  

>Put all the tubes with internal defects like broken welds, leaking 
>seals, open filaments, grids touching cathodes, and on and on in 
>another.
>
>Now use common sense.
>
>Factually, emission life is an issue when the tube is operated at 
>25% of its capability in uninterrupted commercial service. In 
>amateur applications, its mostly something for people to talk about.
>
>
When is Mr. Rauch going to tell us why the 8877 needs no VHF suppressor.  
Why did Henry Radio, Dentron and Alpha use a VHF suppressor in their 8877 
amplifiers.  ?


-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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