[ARC5] [Milsurplus] Cold Filament Inrush Current

[kn7sfz]

On 3/15/2018 2:44 PM, Richard Knoppow wrote:
>    A note on filament voltage: Lowering voltage can extend the life 
> but this applies ONLY to pure tungsten filaments, not to thoriated 
> tungsten or indirectly heated coated filaments. Those generally should 
> be run very close to rated voltage (RCA and Eimac specify something 
> like +/- 5%. There is a little more to this, Eimac says that filaments 
> on thoriated tungsten tubes can be run slightly on the low side 
> provided emission is correct. Needs to be monitored for maximum tube 
> life. For pure tungsten like lamps lowering voltage by 5% will about 
> double lamp life with barely noticeable difference in brightness.

> I am sometimes tempted to send messages without correcting the spell 
> checker. Not often.

Yes, auto correction is your worst enema...

:-)

de kn7sfz







>
> On 3/15/2018 2:20 PM, David Stinson wrote:
>> *From:*Tom Lee
>> *Subject:* Re: [ARC5] [Milsurplus] Cold Filament Inrush Current
>>
>> not only craxy, but crazy, too!
>>
>> -- 
>>
>> I like “craxy” better.
>