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ID = 77938
Tube type:  CW-magnetron 
  Ca. 1925 up to 1945 no serial production. For instance only development samples. *****
Identical to CV79_prototype-8seg
Similar Tubes
Other characteristic (electr. data):
Successor Tubes CV79   CV89  

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Indirect

At GEC E.C. Megaw experimented with magnetron oscillators since the early thirties. The split-anode structure had evolved to four-segment thanks to Yagi in 1928. The four-segment magnetron was investigated by Megaw, Posthumous, Runge et al in the very early thirties. It was observed that more stable operation at low magnetic fields could be achieved by increasing the number of segment pairs. As result, many types of multi-segment magnetron were introduced mainly in Germany, often referred to as interdigital or 'squirrel cage' type.

Megaw experiments with interdigital types led to the introduction of CV79 and of its frequency variant CV89.

Here one of the eight-segment experimental samples made by Megaw. Likely the losses due to the bakelite octal base led to the decision of using all-glass lock-in bases in the production types.

CV79_prototype-8seg: Private collection
Emilio Ciardiello


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