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38

Information - Help 
ID = 3111
       
Country:
United States of America (USA)
Brand:
Tube type:  Vacuum Pentode   Power/Output 
Identical to 38 = UY38A = ER238 = VT-38 = PH238 = NY-68 = UY38 = UY238 = NU-38 = 138A = RYB238 = T-38 = NU-238
Similar Tubes
Normally replaceable-slightly different:
  38038 ; 438
Other class quality (otherwise equal):
  CV712
Other characteristic (electr. data):
  NY-68A
Multiple differences or of other kind:
  6Z-P1 ; 6ZP1
First year 1930 -- Collector info (Sammler)
First Source (s)
Jun.1931 : -- Collector info (Sammler)
Successor Tubes 41  

Base UY-Base, 5 Pins (USA, April 1927) (Codex=Hfo) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
Description

We believed that the tube is from 1931, but some models indicate 1930. Who knows more?

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

38.png
38: Internet
Miguel Angel Trujillo-Rodriguez
    More ...
453_1.png 38: Telefunken Werkstattbuch
Wolfgang Bauer

More ...

Just Qvigstad
38_techdat01.png
38: Sylvania Technical Manual
Peter Hoddow

More ...
Usage in Models 2= 1930?? ; 2= 1931?? ; 6= 1931? ; 34= 1931 ; 7= 1932?? ; 50= 1932? ; 58= 1932 ; 14= 1933?? ; 15= 1933? ; 39= 1933 ; 16= 1934?? ; 10= 1934? ; 50= 1934 ; 8= 1935?? ; 4= 1935? ; 32= 1935 ; 11= 1936?? ; 18= 1936? ; 18= 1936 ; 7= 1937?? ; 15= 1937? ; 7= 1937 ; 6= 1938? ; 7= 1938 ; 3= 1939?? ; 3= 1939 ; 3= 1940?? ; 1= 1940 ; 2= 1941? ; 1= 1942?? ; 1= 1946 ; 1= 2020

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):451

Collection of

 
38_rca_rmf.jpg

38
 

Forum contributions about this tube
38
Threads: 1 | Posts: 1
Hits: 382     Replies: 0
Output pentode type 38
John Dodgshun
05.Sep.21
  1

According to John Stokes, 70 years of Radio Tubes & Valves, the 38 was first introduced in July 1931.

 
38
End of forum contributions about this tube

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