Re: Tube Coil Wattage?

To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
Subject: Re: Tube Coil Wattage?
From: Tesla List <tesla-at-stic-dot-net>
Date: Mon, 10 Nov 1997 07:43:51 -0600
Approved: tesla-at-stic-dot-net


From: 	Mark S. Rzeszotarski, Ph.D.[SMTP:msr7-at-po.cwru.edu]
Sent: 	Monday, November 10, 1997 2:21 AM
To: 	Tesla List
Subject: 	Re: Tube Coil Wattage?

Hell Jeff and All,
Jeff stated:
>How should I refer to the wattage of my Tesla coil.
>
>My tube coil uses two 250th tubes rated at 250 watts
>each. In past posts, I've referred to this coil as a 500 watt
>coil, however, the meters tell me that 3800Vdc at 700ma
>are flowing through the tubes (their maximum rating).
>
>It pulls 11A from a 120Vac outlet.
>
>I assuming that RF power (which I can't measure right now)
>is another measurement all together.
        Each 250TH can dissipate 250 watts of power.  This is the power
wasted in the tubes.  Each tube can output 750-800 watts while dissipating
the 250 watts.   Your 120 volts times 11 amps yields a value of 1320 watts,
so I would estimate power output at 1320-500=820 watts on average.  Since
the tubes are driven well in to class C, the peak power is quite a bit
higher, more like 1600 watts or so, during the half cycle (or less) they are
conducting.  This nonlinear waveform again confounds the analysis!
        As a result, there is no good way to describe the wattage.  Wall
outlet is probably the most meaningfull.  Does your 11 amps value include
the filament transformer current?
Regards,
Mark S. Rzeszotarski, Ph.D.