Re: Vacuum Tubes

To: tesla-at-pupman-dot-com
Subject: Re: Vacuum Tubes
From: "Benjamin W. Bouxsein" <bbouxse-at-comp.uark.edu> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
Date: Sat, 17 Oct 1998 10:02:29 -0600
Approved: terryf-at-verinet-dot-com
On Fri, 16 Oct 1998, Tesla List wrote:

Hello all!

I got a 304TL free awhile back from my department (I saved all the spare
tubes from the junk bin).  Even got a Cunningham 301-A from the 20's, and
an Arcturus half-wave rectifier, and a bunch of weird navy surplus tubes
JAN-CNU-829B, they look like a dual pentode, but not for sure.  Also got a
ton of others.

It is really hard to find anything to build medium size coils around here.
Not many neon shops have trannies over 60mA, and not any old television,
radio shops/stations here.  Just have to improvise I guess.

Can anyone tell me how Walt Noon's Tesla Designer worked.  I am debating
whether to use it in my next coil project.  

Also I would REALLY love to get a hold of another 304. Can anyone help!

thanx!
Ben Bouxsein





> Original Poster: "Stephen G. Stanton" <ulflyer-at-i-cafe-dot-net> 
> 
> Ben:  I would reconsider using the 304s for your coil unless you can get
> them free.  Sockets for them are getting very hard to come by.  Also, each
> tube requires 10 v at 12 A to light it up (you could wire each one in
> parallel but that would require 5 v at 25 A, a huge transformer!!.  That's
> a lot of power just to light filaments.  You'd do better to fish around for
> a used 833A from a local a.m. radio station; they are used in the finals
> and modulators, and often can be had for the asking.  If you had to buy
> one, it's still less money than a USED 304TL.  RF Parts in California sells
> a socket, and the grid and plate connectors for it, costly, but easier to
> find than that same stuff for the 304TLs.
> 
> There have been postings on this list containing the circuit for a
> parallel-833 coil.  You might check the archives for several months back...
> 
> I built a rf amplifier and modulator for my a.m. "California KW" ham
> station.  It uses a single 833A in the final modulated by push-pull 304TLs.
>  I lucked out and found an old rf deck which used the 304s and thus I had
> the sockets and heater transformers.  The whole rig makes a lot of pretty
> light when it's fired up.  It was my "dream" rig when I was a teenager back
> in the '50s.  Now it's "for real"!
> 
> Good luck,
> Stephen, KJ6LH
> 
> 
> 

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