radiomuseum.org
Please click your language flag. Bitte Sprachflagge klicken.

24

Information - Help 
ID = 2656
       
Country:
United States of America (USA)
Brand:
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to 24 = 224 = A224 = RENS324 = NY224 = UY224 = PU024 = EY624 = FY224 = PH224 = SY224 = MY224 = AC24 = F224 = D224 = TS224 = VY224 = CL-24 = Ray-224 = GY224 = C-224 = AC224 = Y224AC = M24A = PAC224 = G-24 = PM224 = UY624 = 424 = VT-28
Similar Tubes
Other shape (e.g. bulb type):
  24S
Normally replaceable-slightly different:
  22AC ; 24A ; 624 ; G-24-S ; R224_Rogers ; RY224 ; SY224A
Heater different:
  C324
Other base:
  24_Coronet
First year 20.Apr.1929 Saga of the Vacuum Tube, 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 / 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.

 
Tube prices 1 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
Essential Characteristics, GE 1973

valvula24.png
24: Internet
Miguel Angel Trujillo-Rodriguez

s_225_g_1.gif 24: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20


Just Qvigstad
Usage in Models 12= 1929?? ; 8= 1929? ; 90= 1929 ; 18= 1930?? ; 43= 1930? ; 231= 1930 ; 46= 1931?? ; 139= 1931? ; 653= 1931 ; 49= 1932?? ; 221= 1932? ; 305= 1932 ; 22= 1933?? ; 33= 1933? ; 78= 1933 ; 9= 1934?? ; 2= 1934? ; 7= 1934 ; 4= 1935?? ; 4= 1935? ; 3= 1935 ; 2= 1936?? ; 2= 1936? ; 1= 1936 ; 1= 1937? ; 1= 1938? ; 1= 1940?? ; 3= 1942?? ; 1= 9999?? ; 2= 9999? ; 1= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1992

Collection of

 
24_2.jpg

24
 

Variants

24 whith dome bulb

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


You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  

Data Compliance More Information