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

12AU7

Information - Help 
ID = 3585
       
Country:
Worldwide
Brand:
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Double Triode   Universal 
Identical to 12AU7 = ECC82 = 95-126-01 = CC82E = 13D8 = B749
Similar Tubes
Normally replaceable-slightly different:
  12AU7-TII ; 12AU7A
Other class quality (otherwise equal):
  5963 ; 5963WA ; 6067 ; CV3900 ; CV4003 ; CV491 ; GB-5963 ; M8136
Other characteristic (electr. data):
  5814
Multiple differences or of other kind:
  7730
First year Mar.1948 70 Years of Radiotubes and V. John W Stokes, 2nd ed, p135-140 incl. 12AX7
First Source (s)
18.Oct.1946 : Electron Tube Registration List 529
Mar.1948 : RCA Receiving Tube Manual RC-15 listed in RCA’s RC15 tube manual dated March 1948
Predecessor Tubes 6AH7   14AF7   7AF7   12AH7GT   A4498  
Successor Tubes CK5814-A   CK5814   CK5814-WA   12AU7A   5873   5814   7730  

Base Noval, 9 pin miniature (USA pico-9) B9A (Codex=No 15)
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
Description

The 12AU7 is probably the first Noval (B9A) tube ever, registered on October 18, 1946, in the Electron Tube Registration List, followed by the 2C51, registered on November 25, 1946.

From the Dowd-RCA archives, we learn that the 12AU7 was preceded by the experimental type A4498 from November 1945. The first lot of 300 units was scheduled for August 1, 1946. The official announcement was made on October 8, 1946.

Although announced on 10/8/46, we do not find any devices with this tube before 1948 and John W. Stokes also mentions 1948 as the first year of regular market introduction. Maybe there were technical problems - maybe in connection with the new base (and/or bulb T-6-1/2)? Since the official announcement letter was sent early in 1947 including JAN preferred tubes, we would like to offer the date of market introduction 1947, but since we show more than 330'000 models of all sorts and since more than 5000 of those models carry a 12AU7 but none with secure date is from 1947, we have to select 1948 because we offer the year of first mass production of models for that year in order to find misplaced ages of models . They get automatically listed if they don't fit with the first year of a tube or semiconductor in the mass market - which is devices (models), not single tubes.

Use in AF phase inverters, TV flip-flops, mixers, multivibrators, TV vertical deflection - similar to the larger 6SN7GT and 12SN7GT. Center-tapped heater permits operation at 12.6V 0.15A.

 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
22 x 56 x mm / 0.87 x 2.20 x inch
Tube prices 9 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature

12au7.png
12AU7: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †

no15_5.png 12AU7: RTT 1974 (Franzis) 13. Auflage
Martin Renz

More ...

Just Qvigstad
12au7_rca_data_01.png
12AU7: Mullard - original papers
Detlef Narten

More ...
Usage in Models 5= 1948?? ; 9= 1948? ; 23= 1948 ; 91= 1949? ; 116= 1949 ; 20= 1950?? ; 290= 1950? ; 134= 1950 ; 4= 1951?? ; 139= 1951? ; 117= 1951 ; 5= 1952?? ; 34= 1952? ; 88= 1952 ; 6= 1953?? ; 89= 1953? ; 304= 1953 ; 9= 1954?? ; 50= 1954? ; 212= 1954 ; 51= 1955?? ; 343= 1955? ; 256= 1955 ; 48= 1956?? ; 799= 1956? ; 156= 1956 ; 8= 1957?? ; 340= 1957? ; 123= 1957 ; 21= 1958?? ; 178= 1958? ; 175= 1958 ; 14= 1959?? ; 130= 1959? ; 175= 1959 ; 94= 1960?? ; 47= 1960? ; 53= 1960 ; 6= 1961?? ; 42= 1961? ; 42= 1961 ; 11= 1962?? ; 17= 1962? ; 59= 1962 ; 10= 1963?? ; 20= 1963? ; 68= 1963 ; 8= 1964?? ; 53= 1964? ; 38= 1964 ; 42= 1965?? ; 20= 1965? ; 21= 1965 ; 7= 1966?? ; 10= 1966? ; 13= 1966 ; 5= 1967?? ; 3= 1967? ; 8= 1967 ; 4= 1968?? ; 9= 1968? ; 16= 1968 ; 3= 1969?? ; 3= 1969? ; 14= 1969 ; 12= 1970?? ; 1= 1970? ; 6= 1970 ; 8= 1971? ; 4= 1971 ; 1= 1972?? ; 3= 1972? ; 3= 1973?? ; 1= 1973? ; 1= 1974? ; 1= 1974 ; 2= 1979? ; 1= 1980?? ; 1= 1981 ; 1= 1982 ; 1= 1992 ; 1= 2000 ; 1= 2007 ; 1= 2008 ; 1= 2012?? ; 2= 2013 ; 1= 9999?? ; 10= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):5372

Collection of

 
ecc82_12au7_mullard~~1.jpg

12AU7
 

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]
  
rmXorg