[AMPS] Misc. Oscillations

[2@vc.net (measures)]

>
>
>
>> From: Mike Sawyer
>
>> 5% over voltage on a tube drastically reduces its life. That's 
>> not Measure's word, look at any RCA tube manual written from 
>> about 1938 on. 
>
>I'm not arguing that improper filament voltage doesn't shorten 
>tube life or reduce RF output.  Simply, given the design of most 
>commercially available amateur amplifiers it would not be safe 
>to include a filament rheostat. 
>
Adjusting filament-v is simpler than tuning a tank.  Several models of 
Henry Radio amplifiers use approx. 6v on 3-500Z/8008 (4.8v) filaments.  
How safe is that, Mr Subich?

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