Virtual Valve Museum
Virtual Valve Museum | search: (use * for wildcard)
About the museumMuseum exhibitsUpdates, new exhibits etc.EquipmentSupporters
*DocumentsValves wanted!Valves for sale or for tradeLinks to other sites, suppliers etc.

Ferranti 1B23 TR Cell, serial number Y3436. Designed to work in an external cavity, frequency range 0.9 to 1.2GHz, at 450kW. The mixture used is hydrogen and water vapour. With a suitable modification kit, the 729A replaced the 702B.

Western Electric produce the same as 729A.

Also marked on the valve is FE 273 and F.LTD E.297.

Overall length is 72mm, 19mm across the glass and 30mm across the disc.


Thanks to John Kaesehagen for information on this device.

This file was last modified 15:24:12, Tuesday September 02, 2014

  FOR SALE: Note that any valve which is not CV marked is now for sale. Contact me via email - see the home page.