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NR89

Sensibly equivalent to:
CV35
    
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A Signal School First
NR89 ('Sutton' Tube). The first Microwave Radar local oscillator, developed by R W Sutton at ASE Extension, Bristol.
Based on principles originating in 1939 at Stanford University, USA, it gave tens of milliwatts output at frequencies around 3 GHz with an 8% tuning range. Samples were available in Autumn 1940, and used by H W B Skinner in his experimental S-band Radar at Swanage. (This also used Megaw's Magnetron E1189 and a 'Cats Whisker Crystal Mixer' made by Skinner himself).
In small scale production at ASEE, EMI and E K Cole from March 1941, it was used in early Type 271 Radar systems.
The NR89 was succeeded in 1941 by CV35, REL8 & CV67.
It is possible that this exhibit is incorrectly labelled as the NR89 has a very long drift space and this device does not. This exhibit may be a later version reflex klystron.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 170 mm tall.
References: Private communication & 3002. Type NR89 was first introduced in 1941.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
g1
h
-
-
-
-
h
k
r

 

Absolute Maximum Operating Conditions
Microwave Valves
Vh
4.0
Updated April 26, 2013.
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