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Title: Mystery Tube Post by: K2FW 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 (http://home.comcast.net/~hockeyguy/images/Mystery%20Tube.JPG) Title: what it might be Post by: John K5PRO 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). Title: Mystery Tube Post by: K2FW 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 Title: Mystery Tube Post by: W2VW 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 Title: Mystery Tube Post by: Vortex Joe - N3IBX 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. Title: Mystery Tube Post by: W2VW on April 28, 2005, 08:15:48 PM A quick check of interelectrode capacitance will ease your quest for knowledge on to the path.
Title: Mystery Tube Post by: K2FW 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!" Title: Mystery Tube Post by: Bill, KD0HG on April 28, 2005, 10:48:00 PM It's definitely an Amperex design.
.. Title: Mystery Tube Post by: Steve - WB3HUZ 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.
Title: Mystery Tube Post by: Joe Long 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
Title: TUBE??? Post by: W2PFY on April 29, 2005, 11:52:36 AM I received an email. Looks like a 5767 tube. I was wrong. I am sorry.
Title: Mystery Tube Post by: Dave KA2J 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
Title: Mystery Tube Post by: VA3ES - Piss-Weak Ed on April 29, 2005, 02:37:41 PM Almost looks like an EEC 1136. This is a British type 4-400. I have several.
Title: Mystery Tube Post by: Vortex Joe - N3IBX 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? Title: Mystery Tube Post by: K2FW 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! Title: Mystery Tube Post by: K2FW on May 01, 2005, 07:34:25 PM OK, have some additional information! AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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 |