AMPEREX TUBE TYPE 12AX7/ECC83

The 12AX7/ECC83 [1] is a miniature, high-mu twin triode, each section of 
which has an individual cathode connection. The construction of the 
12AX7/ECC83 is such that noise and microphony are reduced to a minimum. 
Hum is reduced by the use of a coiled tungsten heater. A center-tapped 
heater permits operation of the tube from either a 6.3 volt or a 12.6 volt 
heater supply

The 12AX7/ECC83 is particularly suited for use in resistance-coupled vol-
tage amplifiers such as those used in the preamplifier and input stages of
Hi-Fi amplifiers, phase inverters, multivibrators and numerous industrial 
control circuits where high voltage gain is desired.



                             GENERAL CHARACTERISTICS


ELECTRICAL

             Cathode                      Coated, unipotential

                                           Series  Parallel
             Heater Voltage, AC or DC       12.6      6.3    Volts
             Heater Current [2]             0.15      0.3    Amps

             Direct Interelectrode Capacitances   With Shield[3] Without Shield

               Grid to Plate (each section)            1.7             1.7  uuf
               Input (each section)                    1.8             1.6  uuf
               Output (section 1)                      1.9             0.46 uuf
               Output (section 2)                      1.9             0.34 uuf

MECHANICAL

             Maximum Overall Dimensions
               Length                                   2 3/16 inches
               Seated Height                           1 15/16 inches
               Diameter                                    7/8 inch

             Mounting Position                               any

             Base                                    Small button, 9 pin
                                                          RETMA #9A





[1] The 12AX7/ECC83 is a direct, high-quality replacement for other brands of
the 12AX7.

[2] When used in equipment which employs series - connected heaters, a 
current-limiting device must be inserted to limit the current when switching on.

[3] With external shield (RETMA # 315) connected to cathode of section under test.