[Amps] Ameritron (et. al.) filament voltages

[Roger D Johnson]

On Thu, Jan 28, 2010 at 03:10:46PM +0800, Alek Petkovic wrote:
>> Just as an aside. When the amp is run on 245V AC, here in Australia, 
>> the voltage measured on the filament pins, with all 4 tubes lit up, 
>> is 7.15V AC. A bit on the high side you could say. Could even call it 
>> scandalous.
>>     
>
>   
 From the Burle site: http://www.burle.com/cgi/byteserver.pl/pdf/tp117.pdf

For thoriated tungsten filaments, a 3% increase in voltage results in a 50%
decrease in tube life! Check the voltage at the tube pins and act 
accordingly.

73, Roger

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