Re: Filament voltages

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

Original poster: "marc metlicka by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>



Tesla list wrote:
> 
> Original poster: "Sundog by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<sundog-at-timeship-dot-net>
> 
> Each tube wants 10v10A, so it's 400w total just idle.  I used tubing
> because it was handy.  The NST core was originally a 12/30, so I'm pretty
> badly abusing the primary, but I don't mind.  After my hiatus (after the FL
> 'Thon), I'll probably get with a buddy and wind a filament tranny using
> foil instead of wire.  Pigs are wound using foil, and handle serious
> current demmands, so that'll make it easier.
> 
> But now I know, I need to have the rated filament voltage *at* the tube.

This would be a loaded 10v-at-40amp+ so 400w x 4 + 1600 w x 1.414 = 2265,
so a 3kw fil trans will provide a good transformer. Start looking for a
1000w HID baLLAST, WIND WITH CT 12G to 10v on the high side windings.
There you go! (trust me?)
Marc M.

> 
> Shad G3-1203
> 
> At 12:03 AM 5/2/2002, you wrote:
> >Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> ><rheidlebaugh-at-zialink-dot-com>
> >
> >Dave: Am I reading correctly, 4 tubes with 10V 10 A fill. If so that is 10V
> >40 Amps or 400 watt. I would not use under # 10 wire to avoid wire heating.
> >        Robert  H
> >
> > > From: "Tesla list" <tesla-at-pupman-dot-com>
> > > Date: Wed, 01 May 2002 08:01:27 -0600
> > > To: tesla-at-pupman-dot-com
> > > Subject: Re: Filament voltages
> > > Resent-From: tesla-at-pupman-dot-com
> > > Resent-Date: Wed, 1 May 2002 08:13:52 -0600
> > >
> > > Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > > <davep-at-quik-dot-com>
> > >
> > > Tesla list wrote:
> > >
> > >> Original poster: "sundog by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > >
> > >> <sundog-at-timeship-dot-net>
> > >
> > >> Hi Dave,
> > >
> > >> The tranny for the Quad 833 is a separate tranny than the
> > >
> > >> plate tranny.  It's wound with 1/8" tubing on an old NST core.
> > >
> > >> Unloaded I get 10.2v on it, loaded that drops to around 7v
> > >
> > >> (pushing 4 tubes).  Do I need to correct the fully-heated
> > >
> > >> filament voltage to 10v, or let it sit at 7v?
> > >
> > >
> > > I would certainly correct it.  cf someone else's
> > > quite thorough posting on the problems with
> > > underpowering the filaments.
> > >
> > > As to the wiring (another other post) I can't see
> > > #8 for 10 Amps for short runs.  #14 should be fine,
> > > even #12 would be generous.
> > >
> > > best
> > > dwp
> > >
> > >
> > >