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ID = 53719
United States of America (USA)
Brand: Sylvania (Hygrade, GTE, Nilco); Emporium (PA)
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to SY224 = UY224 = 224 = 324 = 24 = Y-224 = RENS324 = NY224 = FY224 = MY224
Similar Tubes
Normally replaceable-slightly different:
  224S ; 22AC
Predecessor Tubes UY227  

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

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.

Geri Meier

Michael Schlör


from Just Qvigstad

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