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IWETHEY Home / IWETHEY Board / Hardware Forum / It's an Amperex 211D
Post #48,143
by Andrew Grygus
Picture of Andrew Grygus
8/5/02 11:26:25 AM
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New It's an Amperex 211D
It turns out I have two of them. It's a a high power transmitting triode. One of the two heater pins is also the cathode pin (heater floats at cathode voltage). That leaves one pin for plate and one pin for control grid.

Anode is sintered carbon because metal would buckle at the temperture these things ran at. Hight 7-1/2", dameter 2-1/4"
[link|http://www.aaxnet.com|AAx]
Post #48,262
by a6l6e6x
Picture of a6l6e6x
8/5/02 8:53:44 PM
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New The last glowing anode I saw was in the early 1960's,...
a ham friend of mine built a transmitter from scratch.

In the garage I have a Sylvania 23Z9, (I just checked) so I have a private mini-museum too! It's a Compactron, from the dying days of tubes.
Alex
"Television: chewing gum for the eyes." -- Frank Lloyd Wright
     Do laptop LCDs lose luminance over time? - (deSitter) - (15) - Aug. 4, 2002, 11:26:02 AM EDT
         Apparently, yes. - (a6l6e6x) - (2) - Aug. 4, 2002, 06:01:19 PM EDT
             Bummer - (deSitter) - (1) - Aug. 4, 2002, 07:27:58 PM EDT
                 Yep, slick feature - (SpiceWare) - Aug. 5, 2002, 09:37:06 AM EDT
         Do desktop monitors do this too? - (orion) - (11) - Aug. 4, 2002, 10:16:26 PM EDT
             Yes. - (static) - (8) - Aug. 4, 2002, 10:27:28 PM EDT
                 Some possible degradation mechanisms in TV/monitor tubes. - (Another Scott) - (7) - Aug. 4, 2002, 11:19:03 PM EDT
                     Interesting data point there. - (static) - Aug. 4, 2002, 11:35:07 PM EDT
                     Tungsten cathodes - not - - (Andrew Grygus) - (4) - Aug. 4, 2002, 11:57:35 PM EDT
                         You're right, of course. :-) Thanks. -NT - (Another Scott) - Aug. 5, 2002, 12:04:49 AM EDT
                         Can ya ID the T-shirt tube? - (Ashton) - (2) - Aug. 5, 2002, 07:30:28 AM EDT
                             It's an Amperex 211D - (Andrew Grygus) - (1) - Aug. 5, 2002, 11:26:25 AM EDT
                                 The last glowing anode I saw was in the early 1960's,... - (a6l6e6x) - Aug. 5, 2002, 08:53:44 PM EDT
                     Original Sonys.. - (Ashton) - Aug. 5, 2002, 07:54:49 AM EDT
             The luminance isn't from the LCD - (SpiceWare) - Aug. 5, 2002, 09:47:04 AM EDT
             Had that happen to me a year or two ago - (wharris2) - Aug. 5, 2002, 11:55:22 AM EDT

Don't forget, I was present at an unexplained mass sea sponge migration!
84 ms