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Russian ehlehn-12 tube. It is a storage CRT used in moving target indicators (MTI) associated with radar receivers.

The CRT works by recording a radar trace as a spiral trace on its target. When a second trace is stored, depending on whether a point was already stored or not a signal will be produced. This signal can be used to determine whether a point has moved.

It measures 340mm long x 110mm at the widest point and has a 7-pin base and three external connectors, one on the bell and two on the 'top'.

See the pictures further down.

Other markings on the tube include a tag inside on the 'front' marked I308, OTK3 on the glass, and

 

 LN12

end viewThe middle connector connects to the disk (where the screen should be!) and the outer connector connects to a metal ring.

disk
This view of the connectors shows the actual internal connections.connector
coneThis cone is behind the disk and connects to a connector on the side of the tube. There are no other connections to the cone.
electron gunAt the other end is a normal looking electron gun. The tube deflection is electromagnetic.

Information provided by Damien Derbès

This file was last modified 15:50:45, Saturday November 12, 2011