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Author Topic: Mystery Tube  (Read 9254 times)
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K2FW
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« on: April 28, 2005, 06:09:59 PM »

Does anyone know what tube this may be.  I think it may be either a 3-400 or a 4-400, but I'm not sure.  Tks to anyone who can loan their expertise & tube knowledge!
Take care, Steve K2FW

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John K5PRO
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« Reply #1 on: April 28, 2005, 06:32:10 PM »

It doesn't look like a 3-400Z, 3-500Z or 4-400A made by Eimac. It could be a  5868 industrial heating triode (Amperex or Eimac), or Seimens RS1016, but the ripples on the anode are not exactly the same. Bottle looks about right.
It could also be a Philips TB3-750 triode. It might even be an Amperex version of a 400-500 watt tube. Sorry I can't get any closer. Is it a tetrode or triode (count the # elements in the active region and the # of leads to the base).
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K2FW
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« Reply #2 on: April 28, 2005, 07:36:41 PM »

The tube fits into a SK-410 socket.  Not sure if it's a tetrode or a triode. There are 5 pins on the bottom of the tube & obviously, two of them are for filaments!

Steve K2FW
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W2VW
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« Reply #3 on: April 28, 2005, 07:39:34 PM »

It looks exactly like an older Brown Bover T 380-1 low Mu power triode.
The one shown in this link is  a newer look.

http://www.g8wrb.org/data/Thales/T380-1.pdf
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Vortex Joe - N3IBX
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« Reply #4 on: April 28, 2005, 08:11:07 PM »

Steve,
        I believe it's a French Amperex 3-400a (8463?), or perhaps a 4-400A of French origin (probabaly from their Amperex factory there). The "pagoda" style graphite anode is representative of their new style anode produced in the early 1970's.

Note the shape of the nonex envelope. I'd say it's definitely of French origin. The Amperex 3-500ZG's have a similar style to them; and it's even closer to an Amperex 4-400A.  

Somewhere in my basement I have a French 4-400A. I'll try to unearth it to compare it with the one in your picture.
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Joe Cro N3IBX

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« Reply #5 on: April 28, 2005, 08:15:48 PM »

A quick check of interelectrode capacitance will ease your quest for knowledge on to the path.
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K2FW
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« Reply #6 on: April 28, 2005, 08:30:12 PM »

Quote from: Vortex Joe - N3IBX
Steve,
        I believe it's a French Amperex 3-400a (8463?), or perhaps a 4-400A of French origin (probabaly from their Amperex factory there). The "pagoda" style graphite anode is representative of their new style anode produced in the early 1970's.

Note the shape of the nonex envelope. I'd say it's definitely of French origin. The Amperex 3-500ZG's have a similar style to them; and it's even closer to an Amperex 4-400A.  

Somewhere in my basement I have a French 4-400A. I'll try to unearth it to compare it with the one in your picture.

Tks very much Joe....Sure appreciate it!!!  I have no doubt that you probably have every tube known to mankind located somewhere in the "Vortex!"
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Bill, KD0HG
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« Reply #7 on: April 28, 2005, 10:48:00 PM »

It's definitely an Amperex design.

..
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Steve - WB3HUZ
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« Reply #8 on: April 28, 2005, 10:59:26 PM »

Looks very much like the RF Parts 3-500ZGs I have. I'll have to check more closely tomorrow.
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Joe Long
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« Reply #9 on: April 29, 2005, 07:06:19 AM »

5868 will not fit in a SK-410 socket. It could be a 5867. Thats a smaller version of a 5868. Joe
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W2PFY
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« Reply #10 on: April 29, 2005, 11:52:36 AM »

I received an email. Looks like a 5767 tube. I was wrong. I am sorry.
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Dave KA2J
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« Reply #11 on: April 29, 2005, 01:06:41 PM »

I agree Terry.  The tube looks like a 5867A, which was used for industrial purposes.  I have one home.  Here's some info:  http://www.mif.pg.gda.pl/homepages/frank/sheets/089/t/TB3-750.pdf
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Dave KA2J
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« Reply #12 on: April 29, 2005, 02:37:41 PM »

Almost looks like an EEC 1136.  This is a British type 4-400. I have several.
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Vortex Joe - N3IBX
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« Reply #13 on: April 29, 2005, 04:08:57 PM »

Quote from: Dave Calhoun W2APE
A quick check of interelectrode capacitance will ease your quest for knowledge on to the path.


Dave - Now that's quite a message! Actualy, it's a very astute idea, and probably the only way you'll find out exactly what it is. If you want post the results here and we'll see if we can find out for you.

The main difference with the French tubes, is they seem to have a somewhat lower mu than their American counterparts, though their specs are identical. They seem to be want to be driven harder for a given outpoot.

Possibly like French women; no?
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Joe Cro N3IBX

Anything that is Breadboarded,Black Crackle, or that squeals when you tune it gives me MAJOR WOOD!
K2FW
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« Reply #14 on: May 01, 2005, 10:32:40 AM »

Quote from: Vortex Joe - N3IBX
Quote from: Dave Calhoun W2APE
A quick check of interelectrode capacitance will ease your quest for knowledge on to the path.


Dave - Now that's quite a message! Actualy, it's a very astute idea, and probably the only way you'll find out exactly what it is. If you want post the results here and we'll see if we can find out for you.

The main difference with the French tubes, is they seem to have a somewhat lower mu than their American counterparts, though their specs are identical. They seem to be want to be driven harder for a given outpoot.

Possibly like French women; no?

Joe, when I get a chance, I'll take some reading of the capcitance between the elements.  I don't have any test equipment that is real accurate reading capacitance, but maybe it will be close enough to give some of you guys an idea as to what this tube is!  I'm really curious as to what it is!
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K2FW
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« Reply #15 on: May 01, 2005, 07:34:25 PM »

OK, have some additional information!
This tube is a tetrode.  There is a screen grid on this tube. Also, the interelectrode cap between the control grid & screen grid is about 15pf.  This reading isn't exact, but it's as close a measurement I am able to make.
If anyone else can render a guess as to what this tube is, please let us know.
Tks very much,
Steve K2FW
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