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ID = 25639
United States of America (USA)
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Screen-grid Tetrode   Audio Frequency 
Identical to Y-224 = NY224 = FY224 = SY224 = GSY224 = 224
Similar Tubes
Normally replaceable-slightly different:

Base UY-Base, 5 Pins (USA, April 1927) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2.5 Volts / If 1.75 Ampere / Indirect / Specified voltage AC/DC

Star-Ko made adds for the Y-224 (Y224) "AC Screen Grid Amplifier" at about 1928. Tyne lists about 250 US brands for vacuum tubes in "The Saga of the Vacuum Tube" but not Star-Ko. Since Star-Ko praises that the tube was produced "in tremendous quantities" and sells it for $ 1.39 in quantities with a list price of $ 4.00 we think that Star-Ko bought tubes with lower quality from a big tube maker to sell them off. Or they could sell at a time where the tube was already obsolete. See also X-245.

Dimensions (WHD)
incl. pins / tip
x 123 x 45 mm / x 4.84 x 1.77 inch
Weight 50 g / 1.76 oz
Information source -- Collector info (Sammler)   
Allied Radio Catalog (Knight)   p46 1931

y224_so.png Y-224: ARRL Handbook 1972
Anonymous 10 Collector

Just Qvigstad
Y-224: Vitor Oliveira
Ernst Erb

Collection of



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