Re: Strange tube behavior...

["Ed Phillips" <evp-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Tesla list wrote:
> 
> Original poster: "Grayson B Dietrich" <electrofire-at-juno-dot-com>
> 
> Heyas, all
> 
> In follow-up to what  came of a'questing about info for my 811A tube TC,
> I have one big comment.
> 
> Several Folks told me to run the tube dull red or so. 

	It's OK to do so, but by no means necessary.  All that means is that
you shouldn't run them more than dull red.  Do whaever works best,
keeping in mind that if you run the tube too hot for too long it will go
gassy.  I can 't imagine anyone running a VTTC for many hours total.

Ed

And to do that,
> reduce the grid resistance. So I tried...   ...I have the current meter
> pegged at 300mA, and the plate won't even glow the dullest of reds...
> the grid resistor has been reduced to as little as 500 ohms or smaller.
> This mode of operation also reduces the grid voltage to around 50V or so.
> I incresed the number of turns in the feedback coil by 1 to increase
> this, and it did, but then the discharge was shorter. I -had- at 300mA,
> been betting sparks 3" long.  I also have tried reducing the grid
> capacitance to 3000pF, which  seemded to hurt output. I restored it to
> it's original 5000pF.
> 
> Comments, anyone?
> 
> Thanks,
> 
> Grayson Dietrich
> http://www.electrophile.8m-dot-com
> 
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