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417A

Sensibly equivalent to:
2K41 CV2642 VT-277 WL-417A
See also:
Radio Set AN/CPN-3
    
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This is a type 417A reflex klystron with a 'WL' prefix. The 'WL' prefix indicates the manufacturer. Small klystrons of this class were widely used as local oscillators in radar receivers. The 417A was used in the Radio Set AN/CPN-3.
The 417A was designed to operate at 2.65 to 3.33 GHz and generate 250mW of RF. The cavity is integral to the design and the tuning is mechanical. The RF connectors can be seen to be co-axial.
They were normally tunable over a modest range and were adjusted to be exactly in tune with the (much more powerful) pulse transmitting valve (usually a cavity magnetron). The magnetron generated an RF output only briefly, when pulsed, but the klystron provided a continuous low-level RF signal which could be used to 'beat' (mix) with the faint echo signals in order to reveal small frequency differences of Doppler shifted echoes from moving aircraft.
The type 417A was from fairly early in WWII but this specimen looks to have been made post-war.
The wide metal tube envelope is 35 mm in diameter and, excluding the IO base pins, is 110 mm tall.
References: Datasheet & Private communication.

 

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

 

Absolute Maximum Operating Conditions
Microwave Valves
Vh
Ah
6.3
1.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 05, 2015.
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