Re: Filament help!

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

Original poster: "Sean Taylor" <sean.s.taylor-at-comcast-dot-net> 

An ATX power supply has to have the green wire grounded to turn on.  For
most computer power supplies, all you have to load down is the 5v bus (red),
loading the 3.3 or 12 v bus might help regulation a bit, but the 5 volt is
the main one for it to start up and run.  Typically the 3.3 and 5 come from
the same poewr supply section, the 3.3 is just regulated from the 5 volts.
If the power supply is an AT type, then you won't have to short any wires to
get it to turn on, but the 5v bus still needs a load on it.

Sean Taylor


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, October 25, 2003 10:03 PM
Subject: Filament help!


 > Original poster: "Jim Mitchell" <Wrenchead-at-starband-dot-net>
 >
 > I'm using a 4-125A in my VTTC, and I cant find a filament supply!  I was
 > thinking of using a PC PSU but they have too many wires and I don't know
 > which ones to cross for power on, and which to load to keep regulation
 > proper.  The 4-125A needs 5v at 6.5A for the filament.  Also, any idea if
 > thise tube is better than the 813? I have both and am wondering which I
 > should use.
 >
 >
 >