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Re: [Amps] TB5/2500 options

To: "" <>, "" <>, "" <>
Subject: Re: [Amps] TB5/2500 options
From: "Fuqua, Bill L" <>
Date: Fri, 20 Nov 2015 20:21:47 +0000
List-post: <">>
  I tried a similar tube , 3-1000H in grounded grid just for the heck of it.
It did require a little more than twice the drive power and also grid bias but 
it worked.
  I sold the tube a long time ago.
  I once ran a pair of 250th in grounded grid driven by my homebrew pair of 
6146Bs and it worked 
quite well. I also had to provide bias. 
  My low mu set up some day will be 4 4CX250B with control grid connected to 
cathode and grounded
screen grid. Driven by a single 4CX250B same configuration. 
Bill wa4lav

From: Amps [] on behalf of 
Sent: Thursday, November 19, 2015 4:48 PM
Subject: Re: [Amps] TB5/2500 options

The TB5/2500 is a medium mu industrial heating power triode which works best as 
a Class C amplifier or oscillator.

To use it as an AB2 GG amplifier would probably require impractical drive 
A pair in Class C grounded-cathode push-pull would generate a quite comfortable 
5 kW CW output.


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Datum : 2015-11-19 - 21:57 (UTC)
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Ämne : [Amps] TB5/2500 options

There's one of these tubes available locally.  Would anyone like to
speculate on what it might do?

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