Re: red 304TL

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

Original poster: "claude masetto by way of Terry Fritz <twftesla-at-qwest-dot-net>" <claudmas-at-optusnet-dot-com.au>

Steve,
You need a DC mA meter to measure the grid current ( 50 mA max per tube) and
yes it is measured on the ground side of the grid leak network. It is also
handy to keep an eye on the plate current. I'm not sure if a DMM will
measure correctly because of the electronics being influenced by the strong
field of the coil. I use old fashioned pannel meters.
I was lucky that the plate and grid heatsinks came with the tubes but if you
have access to a lathe and are handy they can be machined from aluminium
quite easily. In Australia large transmitting tubes are rare and expensive
if you can find them.
Regards
Claude.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, November 15, 2002 12:12 PM
Subject: Re: red 304TL


 > Original poster: "Steven Ward by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<srward16-at-hotmail-dot-com>
 >
 > Hello Claude,
 >
 > Actully i looked at your project extensively (on Trimmels page).  Im using
 > about 2uf of doubler capacitance.  My tank cap is only 1000pf.  I try to
 > keep the plate as cool as i can.  And yes, the 18" is with quick bursts of
 > power.  I think at most i hit up to 100v maybe(input that is).  Im still
 > waiting for the doubler MO caps in the mail.  Im using one MO cap with a
 > series of motor run caps.  Im currently exploring the staccato circuit as
 > im building it now.  I will have to say that your coil inspired me!  Your
 > sparks look amazing in my opinion!  As for transformer, its a 2100v MOT.
 > Unknown current.  I dont know the grid current either as i dont have the
 > metering to do so.  What is needed to measure grid current?  A DC MA
meter?
 > I have some cheap DMMs that have dc ma selections  Will this work?  Im
 > guessing the potential on the ground side of the grid leak network is low?
 > And that is in fact where the measurement is taken correct?  Oh, and
 > Claude, one more question, do you happen to have or know of a source for
 > heatsinked plate connectors?  Im using a ceramic plate cap right now with
a
 > small fan on it when i do crank it up.  Im sure the heatsink would
 > help...  Thanks,
 >
 > Steve Ward.
 >
 >
 >
 >
 >
 >
 > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >To: tesla-at-pupman-dot-com
 > >Subject: Re: red 304TL
 > >Date: Thu, 14 Nov 2002 08:01:13 -0700
 > >
 > >Original poster: "claude masetto by way of Terry Fritz
 > ><twftesla-at-qwest-dot-net>" <claudmas-at-optusnet-dot-com.au>
 > >
 > >Hello Steve,
 > >I've built a dual 304tl VTTC and run the tubes in short bursts for a few
 > >seconds when the plates glow a real bright orange as I was lucky to get
 > >these tubes real cheap and I don't want to melt a hole in the plate. The
 > >insides of the four plates are a lot brighter because of the concentrated
 > >heat.
 > >I can get 28" out of this system and when I was running with one tube I
also
 > >obtained 18" with a bright glowing plate.What size transformer and what
size
 > >doubler cap are you using?
 > >I would'nt push these tubes any more when they glow like this. What is
your
 > >plate current and grid current.
 > >Regards
 > >Claude.
 > >
 > >
 > >----- Original Message -----
 > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >To: <tesla-at-pupman-dot-com>
 > >Sent: Thursday, November 14, 2002 10:56 AM
 > >Subject: red 304TL
 > >
 > >
 > > > Original poster: "Steven Ward by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
 > ><srward16-at-hotmail-dot-com>
 > > >
 > > >
 > > > Hello,
 > > >
 > > > Im working on my 304TL VTTC, and with a doubler im up to about 18"
with
 > > > only one tube.  Problem is, the tubes getting red to say the least!  I
 > > > would actually have to say almost an orange!  I know this is probably
 > > > bad.  But, does anyone know how red these tubes are spec'd to run?  I
 > >think
 > > > im up to 90v on the variac, so thats about 3000v or so on the plate.
Im
 > > > going to look into staccato circuits, but for now i would like to know
how
 > > > red/orange can this tube run.  If anyone has this type of experience
or
 > > > info on this tube, let me know.  Thanks,
 > > >
 > > > Steve Ward.
 > > >
 > > >
 >
 >