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Machlett “CYR” Tube |
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(E.R.N.Grigg - Trail of the Invisible Light - Charles C.
Thomas, 1965 - p.82) |
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The tube proper is about 31cms long,
excluding the radiator. The black metal housing is 26.5cms long, 9cms in
diameter and about 6mms thick, with an additional internal lead lining of
2mms. The cathode end of the housing is snugly closed, with a protruding
screw-type filament connection, while the anode end is about a 1cm thick
ceramic disc fitted with six 1cm aeration holes, symmetrically placed around
a central hole through which passes the anode shaft. A nine-layer black-painted
copper heat radiator is screwed on this protruding anode shaft and connects
directly to the high voltage line.
The tube is of the line focus type, with a low target angle, and a
projected focal spot estimated at about a 3mm square. The round
radiation window is fitted with a removable aluminium
filter 0.5 mm thick. No other specifications are available. |
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This particular tube is known to have been in use in the mid-thirties
at the |
