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COSSOR NEON TUNEON TUNING INDICATOR, 1934
Small neon lamps that are used as indicators in electronic equipment. Called "Tuneons" in the 1930s radio sets, that were fitted with the new Tunograph (Item A1303) which could improve the stability and strength of the signal.
However such a device was not cheap, the Tuneon was no more than a modulated neon, and at a lower cost, but it did do what was intended.
Not many receivers were manufactured using this device, as the new RCA 6E5G came out in 1935, at the same cost as an ordinary valve.
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- I first came across the "Tuneon" in my early 'teens. After identifying it I sought the wisdom of an experienced radio repair man who showed me where it could be inserted into the receiver circuitry. The longer of the two electrodes was connected to the receiver's HT line via a 330K resistor and the shorter electrode to the anode of the IF amplifier valve via an RFC to prevent noise from the Tuneon getting into the detector and to improve the stability by preventing IF radiation. It worked!
.......... Graeme.M.Young., Ravenshead, Nottingham. NG15 9EZ, 16th of August 2011