Re: Vacuum Tubes

• To: tesla-at-pupman-dot-com
• Subject: Re: Vacuum Tubes
• From: RWB355-at-aol-dot-com (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Sun, 18 Oct 1998 11:05:09 -0600
• Approved: terryf-at-verinet-dot-com

 
 Original Poster: "Stephen G. Stanton" <ulflyer-at-i-cafe-dot-net> 

Hi Stephan,

My apologies to you.
In this case you are (of course) correct. Maybe I should have looked in a tube
substitution manual?!? (Altough I´m not sure if I would have found this one in
a german manual.) Very interesting construction. Was this tube a military
unit? This might explain the dual filament. Do both filaments heat the total
tube or is it divided into multiple (seperate) tubes in a single galss
envelope.? I have seen tubes with ct´d filaments, but never a tube with two
completely seperate filaments. What was the idea behind this scheme ?

coiler and tube greets from germany,
Reinhard

 
 Reinhard,
 
 The 304TL is a strange animal, filament-wise.  There are actually two
 filaments in each tube.  These filaments are five volt filaments.  You can
 hook the two sets up in parallel, and the tube will draw 5 v at 25 amps. 
 You can also hook them up in series, and use a 10 v 12.5 amp transformer. 
 Those are usually more available than the 5 v 25 amp variety.
 

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