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24

Information - Help 
ID = 2656
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to 24 = VT-28 = 224 = A224 = RENS324 = NY224 = UY224 = PU024 = EY624 = FY224 = PH224 = SY224 = MY224
Similar Tubes
Other shape (e.g. bulb type):
  24S
Normally replaceable-slightly different:
  22AC ; 24A ; 624 ; C-224
Heater different:
  C324
First year 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
Filament Vf 2.5 Volts / If 1.75 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 1.75 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.

 
Tube prices 0 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
Essential Characteristics, GE 1973

  valvula24.png
  24: Internet
Miguel Angel Trujillo-Rodriguez
 
24_2.jpg
24: P.ST
Peter Steffen

 
Variants
 
s_225_g_1.gif
24: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe

 

Usage in Models 1= 1921 ; 12= 1929?? ; 8= 1929? ; 87= 1929 ; 18= 1930?? ; 38= 1930? ; 214= 1930 ; 41= 1931?? ; 131= 1931? ; 632= 1931 ; 48= 1932?? ; 220= 1932? ; 276= 1932 ; 18= 1933?? ; 25= 1933? ; 65= 1933 ; 9= 1934?? ; 1= 1934? ; 5= 1934 ; 3= 1935?? ; 3= 1935? ; 2= 1935 ; 2= 1936?? ; 2= 1936? ; 1= 1936 ; 1= 1938? ; 1= 1940?? ; 3= 1942?? ; 1= 9999? ; 1= 9999
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1869

24*Box

collezione privata
Davide Casarosa

collezione privata
Davide Casarosa
 

  Variants


P.ST
Peter Steffen
24*dome_bulb

24 whith dome bulb

10.Mar.2013 Jacob Roschy

 
24*Violet

Made in Italy by Fivre for distinctive use in radio sets of the related company RadioMarelli this tube has violet-reddish glass bulb.

21.Feb.2013 Emilio Ciardiello


collezione privata
Davide Casarosa
   

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