[Boatanchors] LINE VOLTAGE, FILAMENT VOLTAGE and SANITY

[Ray, W4BYG]

Very interesting reading, even though written for high power apps.  The 
basic principles still apply.

Also interesting were the findings of significant shortened tube life 
from repeated "on and off" cycles.  Seems to indicate if you operate 
your amplifier daily, leave it on.  Better yet, slightly reduce the 
filament voltage during standby.

Thank you for sharing the URL.
Ray, W4BYG


On 1/6/2015 10:43 PM, Richard Knoppow wrote:
>
> ----- Original Message ----- From: "Gary Peterson" 
> <kzerocx at rap.midco.net>
> To: <boatanchors at mailman.qth.net>
> Sent: Tuesday, January 06, 2015 5:44 PM
> Subject: [Boatanchors] LINE VOLTAGE, FILAMENT VOLTAGE and SANITY
>
>
>> “It is well know in the broadcast industry that excessive heater voltage
>> _greatly __reduces_ tube life.
>> Ray, W4BYG”
>>
>> Having worked in the technical end of radio for 50 years, this next 
>> month, I can verify the validity of this statement.
>>
>    There is an interesting paper on high power tubes at:
>
> http://www.ok1rr.com/tubes/burle/Techniques-to-Extend-the-Service-Life-of-High-Power-Vacuum-Tubes.pdf 
>
>
>
> -- 
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
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