AMPEREX TUBE TYPE 12AX7 / ECC83
The 12AX7 / ECC831 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 voltage 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.
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.