I read somewhere that a power tube might last 10 times longer if pre-heating is used.
However since an 833A might last 10,000 hours, I figure if it lasts 1000 hours
instead, that's probably long enough for my use in a VTTC. A few times
I did use pre-heating, but I usually didn't bother.
Cheers,
John
-----Original Message-----
From: Steve White <steve.white1@xxxxxxxxx>
To: Tesla Coil List <tesla@xxxxxxxxxx>
Sent: Sun, Feb 18, 2018 12:30 am
Subject: [TCML] 833A vacuum tube filament current
Does anyone know if limiting the in-rush current during a pre-heating period for a 833A filament will extend its life? I looked in many 833A data sheets and in only one did I find any mention of limiting filament start-up current. The Machlett 833A data sheet states a maximum filament current of 20 amps. If it will extend the life of the tube I can easily use a resistor to make a pre-heating circuit. Right now for my Amperex 833A VTTC, I just switch the filament on with 10 volts with no pre-heating. Any thoughts?
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