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2A5

Information - Help 
ID = 2649
       
Country:
United States of America (USA)
Brand:
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Vacuum Pentode   Power/Output 
Identical to 2A5 = UZ-2A5 = UZ2A5_Code9 = CV1834 = PH2A5 = PZH = VT158_GPO = CV1707 = NU-2A5
Similar Tubes
Other shape (e.g. bulb type):
  M2A5
Normally replaceable-slightly different:
  2A5E ; 38215 ; 95 ; G-2A5 ; KR25
Heater different:
  42
Other base and other heater:
  6F6G
First year 1932 -- Collector info (Sammler)
First Source (s)
Jun.1933 : -- Collector info (Sammler)
1932 : Communications Receivers
Predecessor Tubes 47   PZ  
Successor Tubes 6F6   6F6G  
Base 6-Pin-Base U6A, old, USA (Codex=Kdo)
Was used by Radio/TV-reception etc.
Filament Vf 2.5 Volts / If 1.75 Ampere / Indirect / Specified voltage AC/DC
Description

The RME 9 Comms receiver is from 1932 and makes use of the 2A5. see Moore, Comm's. Receivers.

* RMA/JEDEC register record available by courtesy of TCA* - This tube was already listed by several manufacturers when RMA started its standardization in 1934. In order to characterize popular receiving types, manufacturers were asked to supply average characteristics as measured on production lots. Here are the filled answer forms supplied by Radio Valve Co., Raytheon, Sparton, Triad, Tung Sol, Ken Rad, Hytron and Arcturus. Full record is downloadable here. A Pilot brand 2A5 has been located which has an S 17 bulb, Most have an St14 bulb.

 
Dimensions (WHD)
incl. pins / tip		 x 108 x 45 mm / x 4.25 x 1.77 inch
Weight 49 g / 1.73 oz
Tube prices 3 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
70 Years of Radiotubes and V.   p. 63
Taschenbuch zum Röhren-Codex 1948/49
Tube Lore (II)
2a5_corrected.png
2A5: corrected version
Roland Langfeld
470.png 2A5: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
Just Qvigstad 		2a5_techdat01.png
2A5: Cunningham Radiotron Manual
Peter Hoddow
More ...
Usage in Models 7= 1932?? ; 22= 1932? ; 25= 1932 ; 25= 1933?? ; 60= 1933? ; 304= 1933 ; 42= 1934?? ; 72= 1934? ; 316= 1934 ; 37= 1935?? ; 39= 1935? ; 155= 1935 ; 5= 1936?? ; 17= 1936? ; 45= 1936 ; 3= 1937?? ; 3= 1937? ; 10= 1937 ; 3= 1938?? ; 1= 1938? ; 4= 1938 ; 1= 1939?? ; 1= 1939? ; 7= 1939 ; 2= 1940?? ; 2= 1940 ; 4= 1941? ; 1= 1945?? ; 1= 1950?? ; 5= 9999
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1219

Collection of

Timothy Koceja (USA)
David Erali (USA)
George Papaiz (CDN)
Bruce Morgenstern (CDN)
Fin Stewart (AUS)
Michael Gnaedig-Fischer (MEX)
Bruno Candreia (CH)
Christian Schaufelberger (CH)
Peter Steffen (CH)
Patrice Zeissloff (F)
Bekir Yurdakul (F)
Patrice Follet (F)
Jean-Jacques Pontigny (F)
Antonio Bordini (I)
Benedetto Pirani (I)
Patrick Marinus (B)
Georges Werts (B)
Collection of a member from FIN
Danko Tkalec (HR)
Michael Seiffert (D)
Karlheinz Fischer (D)
Karl - Heinz Bossan (D)
Peter Pfeiffer (D)
Documents about this component
  RMA qualification record for tube types 76, 77, 78, 6C6, 6D6, 75, 41, 42, 2A5, 85, 6F7, 80, 84 and 6A7. 1569 KB
 
2a5_3.jpg

2A5
 

Variants

Metal coated cylindrical glass version. Complete name: M2A5. The letter "M" appears only on the boxes and enclosed paperwork, not on the tubes. Please klick here: M2A5
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