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ID = 73512
United States of America (USA)
Brand: Nutron Manufacturing Co.; Passaic, N.J.
Developer: Nutron Manufacturing Co.; Passaic, N.J. 
Tube type:  Dual-Grid Tetrode   Detector 
  <1925 very rare. ***
Identical to SolodyneTube

Base UV-Base (4 Pins+Bayonet, USA 1914 WE) Sidecontact.
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.3 Ampere / Direct / Battery =
Description This tube is a detector and amplifier double grid tetrode and was the first of its type made in the US. The tube acted as both oscillator and modulator in super heterodyne circuits and as a detector and amplifier in reflex circuits. The tube has a standard brass UV base and the extra grid is solded to the edge of the brass base. The element is cylindrical and mounted vertically. The anode is approximately 14 mm diameter, outer grid 10 mm and inner grid 5 mm. On some tubes, printed on the base is also the date of manufacture, Jul 30? 1924. Early versions of the tube had clear bulbs with no getter. A patent was applied for late in 1924 for a "Silben Spot Tube" getter process where a small window of clear glass could be made in the gettering on the inside of the bulb during manufacture. No evidence has been found that a patent was granted for this but the tube was advertised in Radio News, November 1924, page 728. The company created five single tube circuits for the tube's use and it could also be used in multi tube sets, in conjunction with 201A types.

Dimensions (WHD)
incl. pins / tip
44 x 108 x 35 mm / 1.73 x 4.25 x 1.38 inch
Weight 57 g / 2.01 oz
Information source Radio News   October and November 1924
- - Manufacturers Literature   Undated brochure

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