Re: New tube for Tesla Coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

What's the duty cycle for the 337kW pulse duty?  You can back into the
average rating that way? (0.1% might be a typical radar duty factor, but so
might 1%.. )
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, July 30, 2003 10:12 PM
Subject: New tube for Tesla Coil


 > Original poster: "Kevin Eldredge by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <kreld-at-flash-dot-net>
 >
 > All
 >
 >    The local electrical surplus store (Dessertway Lab) recently had a new
 > batch of old aviation equipment from FAA, most being radar stuff.  I
bought
 > a bunch including a radar hard tube pulser (modulator) which had 3 #8252w
/
 > 4pr60c switching tubes rated 337 kW pulse duty, 20,000 volt, 18 amp plate
 > volt/amp.
 >   I threw together a scramble Coil on the workbench & powered it up to
4000
 > volts, 250 mA with no attempt in tuning at all, just to see if it would
 > oscillate, it does well. It's a tetrode, and I'm using the grid only for
 > feedback, no sreen connection. A 3" x 12" coil had 3" sparks (no tuning,
 > just the first HV mica cap I grabbed and wired accross the primary
 > coil)  Question, plate dissipation is 60 W, anyone know how much average
 > power I could run this tube since it is rated pulse duty?
 >
 >    Other good tubes found were # JAN 4D32's that look good for small
Coils.
 >
 > Coiling in Oklahoma
 > Kevin E.
 >
 >