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ID = 7412
United States of America (USA)
Brand: Ken-Rad, The Kentucky Radio Corporation; Owensboro, KY
Developer: Ken-Rad, The Kentucky Radio Corporation; Owensboro, KY 
Tube type:  Full-Wave Mercury-Vapor Rectifier   Power-supply 
Identical to 98 = KR28
Similar Tubes
Normally replaceable-slightly different:
  6Z4 ; 84/6Z4
Predecessor Tubes KR28  

Base UY-Base, 5 Pins (USA, April 1927) (Codex=H)
Was used by Radio/TV-reception etc.
Filament Vf 6 Volts / If 0.5 Ampere / Indirect / Parallel, (AC/DC defined voltage)

This tube was developed by Ken Rad in 1933 for use in automobile receivers. It was also sold to the Utah company for use in field coil power supplies used in some of their theatre sound systems. This tube was the P861 but had "Made by Ken Rad" on the base. It was originally sold as the KR28.

Dimensions (WHD)
incl. pins / tip
x 103 x 38 mm / x 4.06 x 1.50 inch
Weight 34 g / 1.20 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (II)   Page 29
-- Collector info (Sammler)
98: Bob Millard collection
Fin Stewart

Michael Schlör


from Just Qvigstad

Usage in Models 1= 1932?? ; 1= 1933

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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