Re: Toob coil questions

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

Original poster: robert & june heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

DAN: The 811 with carbon plates will take the same abuse. I use them in my
tube TC and they glow red. The metal plate 811 will not take that abuse.
--         Robert   H


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Sat, 20 Sep 2003 08:42:25 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Toob coil questions
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Sat, 20 Sep 2003 08:50:40 -0600
 >
 > Original poster: dhmccauley-at-spacecatlighting-dot-com
 >
 >>>> 16" is a LOT from a pair of 811As... the coil may be designed to drive
 > the
 >>>> tubes far beyond their ratings... You better watch that the pates DO
 > NOT
 >>>> get even a bit of color on them.  If they turn red at all, you are
 > pushing
 >>>> things hard!
 >
 > Although this seems to be the trend among some of the coilers here, the 811A
 > and in particular the 833As can be reliable run bright red continuously.
 > In one of our legacy transmitters at work, we have large arrays of 833A (not
 > 833C) vacuum tube.  I was very surprised to see that all of these tubes were
 > glowing
 > bright red on the plates.  The technicians there assured me the running the
 > 833As red hot was normal and that the 833As were meant to take that abuse.
 > In fact, he
 > said the most common failure among the tubes was not any internal damage to
 > the plates or filament from these power levels, but the actual glass
 > actually melts and implodes
 > on itself.  He showed me a few examples of this and i couldn't believe a
 > tube could actually go through that type of deformation.
 >
 > Dan
 >
 >