Antique radios, Old Time Radios

224

Country:	United States of America (USA)	Brand:	Common type USA
		Developer:	Westinghouse El. & Mfg. Co. - see also Canadian W.
		Tube type:	Screen-grid Tetrode RF/IF-Stage

Tube ID = 2654


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Identical to	224 = 324 = 24 = 24A = UY224 = Y-224 = RENS324 = NY224
Similar Tubes	Normally replaceable-slightly different: 224S; 22AC
First Series	Apr.1929 Saga of the Vacuumtube, Tyne page 321 and 322
Predecessor Tubes	UY227

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: 1.7 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. Text in other languages (may differ)
Literature	Taschenbuch zum Röhren-Codex 1948/49

K.H.Fischer
Karlheinz Fischer

Telefunken Werkstattbuch
Wolfgang Bauer

Usage in Models (calculation each 25th of the month)	4= 1928?? ; 38= 1928? ; 3= 1929?? ; 4= 1929? ; 72= 1929 ; 28= 1930?? ; 8= 1930? ; 99= 1930 ; 6= 1931?? ; 16= 1931? ; 60= 1931 ; 2= 1932?? ; 9= 1932? ; 18= 1932 ; 2= 1933?? ; 5= 1933? ; 1= 1934?? ; 4= 1934? ; 2= 1935?? ; 2= 1936?? ; 1= 1937?? ; 1= 1937? ; 1= 9999 ;
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 386

No further Information for

224

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