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Rubon Ltd were based at 189 New King's Road, Fulham, London, SW6.
Rubon made their own valves during 1924. The company was bought by Marconi and manufacture continued until 1927 under the Marconi label and with the BBC stamp.
Popular Wireless review: Puratone valves, only one type was supplied, and that for general purposes, requiring 4 Volts LT and from 30-100 Volts HT. Filament consumption is 1.0 amp approximately in the case of the samples submitted. They are priced at 8s. 6d., which, for an English-made valve, is remarkably cheap.
An original note is struck in the design, inasmuch as a wire gauze anode is employed. It is styled as a 'filter anode', but we fail to see what it filters.
The Puratone valves on test functioned remarkably well; better, indeed, than we expected them to in view of the fact that there were noticeable several little peculiarities in the disposition of the electrodes. In the case of one valve, nearly a quarter of an inch of filament protruded beyond the area enclosed by the grid and anode. One point we notice with pleasure, however, is that a very ingenious springing device is incorporated into one of the filament supports for the purpose of preventing the filament from sagging. This, perhaps, may necessitate a lengthening of the filament.
We tested both the valves in HF, Detecting, and LF capacities. As detectors, they are excellent as good as any valve we have tried. As LF amplifiers they are very good indeed, and when grid bias up to some 3.0 V is employed when they are used in a second stage, very clear distortion less magnification results. Lastly, for HF work, their performance was good, although grid bias was necessary even in a two-valve circuit. If all the Puratones Ruben's manufacture are as good as the samples submitted, and there is no reason why they should not be, then we should imagine they will find a ready market.
References: Keith Thrower British Radio Valves Vintage Years and Popular Wireless, Oct 11, 1924.
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