Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 17469
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Developer: Bell Labs; Murray Hill, NJ. 
Tube type:  TR-switch   SHF/EHF (>3 GHz) 
Identical to 724A = CV2656
Similar Tubes
Other characteristic (electr. data):

Was used by Radar
Filament No heater

Disc-seal TR/ATR tube, with keep-alive electrode connected to a cap. External cavity at 8.6 to 9.7 GHz frequency.

Developed to protect solid state diode mixers against RF pulses generated by the magnetron transmitter, this TR switch incorporetes an igniter, the keep-alive electrode, that gives a bias ionization and improves spike protection of the receiver. The copper discs are shaped and supported by a special glass ring, to obtain a low temperature coefficient and a resonance drift with temperature as close as possible to that of the magnetron. The tubes were pretuned before exhaust, placing them in a special cavity and deforming the copper discs with a tool.

Also made by Sylvania.

Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   BSTJ, The Gas Discharge T/R Switch
Tube Lore (I)
724A: Private collection
Emilio Ciardiello


You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]