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Re: 4 Grids
Original poster: "Steve Ward" <steve.ward-at-gmail-dot-com>
I have run across many partially dead 304TLs. I did in fact run 1/2
of the tube in a VTTC circuit. I think the most i got was about a 12"
spark and the plate was very cherry red. I didnt care about the tube
so i didnt mind how hot the plate was getting.
Anyway, im not sure if you can actually run just 3 of the filaments,
unless somehow the 4th was shorted out? From what i remember, they
wired the filaments in strings of 2, and there is no center tap
between each single filament, but there is between all 4. So you
could either series all 4 filaments at 10V, or you could parallel 2
strings of 2 at 5V. Anyway, it may be worth your time to just play
around with half the tube, its probably not good for anything else.
On Sun, 03 Oct 2004 14:46:43 -0600, Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Rich" <rdjmgmt-at-socket-dot-net>
> I was bringing a 304tl up to operating voltage on the filaments. Well I
> guess they call the 304 for a reason, 3 for triode and 4 for the 4
> filaments. One tube has one bad filament. I have the tube set up on a
> series circuit because my main filament transformer is 10v. I found out
> quickly I can't run it that way. One filament will pull to much
> voltage. Before I junk the tube, I could wind another 5v trans, has any
> one ever run one with just three of the filaments.