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38

Country: United States of America (USA) Brand: Common type USA tube/semicond. Common type USA tube/semicond. Canadian Marconi Co. Ltd. (CMC, Esterline), Marconi's Wireless; Montreal, QC Philco, Philadelphia Stg. Batt. Co.; USA Raytheon Mfg. Co.; Cambridge, MA Sylvania (Hygrade, GTE, Nilco); Emporium (PA) Triad Television & Mfg. Co.; Pawtucket, RI Tube type:  Vacuum Pentode   Power/Output  Identical to 38 = UY38A = ER238 = VT-38 = PH238 = 138A = RYB238 = T-38 = NU-238 = NU-38 = NY-68 = UY238 = UY38 Similar Tubes Normally replaceable-slightly different:   38038 ; 438 Other class quality (otherwise equal):   CV712 Other characteristic (electr. data):   NY-68A ; P238 Multiple differences or of other kind:   6Z-P1 ; 6ZP1 First year 1930 -- Collector info (Sammler) First Source (s) Jun.1931 : -- Collector info (Sammler) Predecessor Tubes 68   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?   Dimensions (WHD) incl. pins / tip x 123 x 38 mm / x 4.84 x 1.50 inch Weight 36 g / 1.27 oz Tube prices 1 Tube prices (visible for members only) Information source Essential Characteristics, GE 1973    Tube Lore (II)   p. 27 -- Collector info (Sammler) Taschenbuch zum Röhren-Codex 1948/49 38: Internet Miguel Angel Trujillo-Rodriguez     More ... 38: Telefunken Werkstattbuch Wolfgang Bauer More ... Just Qvigstad 38: Sylvania Technical Manual Peter Hoddow More ... Usage in Models 2= 1930?? ; 2= 1931?? ; 7= 1931? ; 34= 1931 ; 7= 1932?? ; 50= 1932? ; 58= 1932 ; 14= 1933?? ; 15= 1933? ; 40= 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):453 Collection of Justo Puertas-Paule (E) Patrice Follet (F) Carlos A. Pieroni-García (ROU) David Erali (USA) Peter Pfeiffer (D) Robert Gillespie (USA) Christian Schaufelberger (CH) David Pfister (CH) Collection of a member from FIN Valery Gromov (RUS) Baptiste Hobbe (CDN) Tor Steinnes (N) Benedetto Pirani (I) Bruce Morgenstern (CDN)

38

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Hits: 543     Replies: 0 Output pentode type 38
John Dodgshun 05.Sep.21	1 Output pentode type 38  According to John Stokes, 70 years of Radio Tubes & Valves, the 38 was first introduced in July 1931.

 

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