Antique radios, Old Time Radios

24

Country:	United States of America (USA)		Brand:	Common type USA
			Tube type:	Screen-grid Tetrode RF/IF-Stage

Tube ID = 2656


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Identical to	24 = VT-28 = 224 = A224 = RENS324 = NY224 = UY224
Similar Tubes	Other shape (e.g. bulb type): 24S Normally replaceable-slightly different: 22AC; 24A; 624 Heater different: C324
First Series	20.Apr.1929 Saga of the Vacuumtube, Tyne page 321 and 322.
First Source (s)	May.1929 : 70 Years of Radiotubes and V.
Predecessor Tubes	UY227
Successor Tubes	1929 24A

Base	UY-Base, 5 Pins (USA, April 1927) (Codex=Ha) Top contact with a cap
Was used by	Radio/TV-reception etc.
Filament	Vf 2.5 Volts / If: 1.7 Ampere / -: Indirect / -: Parallel, (AC/DC) /
Description	According to Tyne, page 321, this first AC screen-grid tetrode, the UY224, later called 224 or 24' in the US was introduced in April 1929. It derived from the first US indirect heated triode UY227 from 1927 with the same heater-cathode combination. The oxide-coated filament operates at 2.5 volts AC or DC, taking 1.7 amperes. With 180 volts on the anode (-1.5 inner control grid, 75 volts on screen grid) is resulting 4 milliamperes, the amplification factor is a bout 420, the anode impedance 400 000 ohms and the mutual conductance 1050 micromhos. Direct capacitance between anode and control grid is less than 0.01 picofarad which made Neutrodynes obsolete beginning in 1929.
Tube prices	0 Tube prices (visible for members only)
Literature	Taschenbuch zum Röhren-Codex 1948/49 Essential Characteristics, GE 1973


	Internet Miguel Angel Trujillo-Rodriguez

RCA UY224, 1931
John Hupse

W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe

Usage in Models (calculation each 25th of the month)	1= 1928? ; 1= 1928 ; 13= 1929?? ; 7= 1929? ; 79= 1929 ; 20= 1930?? ; 36= 1930? ; 159= 1930 ; 34= 1931?? ; 112= 1931? ; 577= 1931 ; 44= 1932?? ; 222= 1932? ; 228= 1932 ; 12= 1933?? ; 16= 1933? ; 46= 1933 ; 8= 1934?? ; 1= 1934? ; 5= 1934 ; 1= 1935?? ; 2= 1935 ; 2= 1936? ; 1= 1936 ; 3= 1942?? ; 5= 9999 ;
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 1635

No further Information for

24

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