Cossor Model 339 Double Beam Oscilloscope Repair

Hi everybody this week we have a very special episode where Alan the great repairs the Cossor model 339 dual beam World War 2 oscilloscope

The Cossor Model 339 Double Beam Oscillograph is an oscilloscope with a 4.5" double beam 09 type cathode ray tube that could without any modification be replaced with a 26 type single beam CRT.

The instrument was delivered with 09J (blue) CRT as standard, but it could be fitted with the a 09D (green) or 09G (blue-green with 10 sec. green afterglow) type CRTs.

The dual beam and single beam tubes were directly interchangable; the two vertical amplifiers working in push-pull for the single beam. One channel showed an inverted image when using the dual beam tube.

For photographic recording, Model 427 Camera could be used.

The Model 339 is based on the pre-war Model 3339 which used different valves.

There were intermediate versions between the 3339 and 339 models. For example, some of the later 3339 were also fitted with the front panel switch and indicator lamp.

Country Great Britain (UK)
Manufacturer / Brand Cossor, A.C.; London
Year 1942–1946
Category Service- or Lab Equipment
Number of Valves - 8
Net weight (2.2 lb = 1 kg) 20 kg / 44 lb 0.8 oz (44.053 lb)
Price in first year of sale 45.00 GBP

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Love and Peace Bangers and Chumley

Take the fear out the gear titles theme tune is called Vintage Jarre copyright 2012 Simon Hunns