Antique radios, Old Time Radios
24
Base |
UY-Base, 5 Pins (USA, April 1927) (Codex=Ha)
Top contact with a cap.
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Filament |
Vf 2.5 Volts / If 1.75 Ampere / Indirect / Specified voltage 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 1.75 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.
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Tube prices |
1 Tube prices (visible for members
only)
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Information source |
Taschenbuch zum Röhren-Codex 1948/49
Essential Characteristics, GE 1973
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24: Internet
Miguel Angel Trujillo-Rodriguez
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24: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20
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Just Qvigstad
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24: My schematic collection.
Pier Antonio Aluffi
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2000
Collection of
Collection of a member from FIN Collection of a member from D
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Variants
24 whith dome bulb
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Made in Italy by Fivre for distinctive use in radio sets of the related company RadioMarelli this tube has violet-reddish glass bulb.
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