The 12AX7-A is a miniature high-mu twin triode each section of which has an individual cathode connection. The 12AX7-A is especially suited for use in resistance-coupled voltage amplifiers, phase inverters, multivibrators, and numerous industrial-control circuits where high voltage gain is desired. A center-tapped heater permits operation of the tube from either a 6.3 volt or a 12.6 volt heater supply. Use of the 12AX7-A is advantageous in applications that require low hum and microphonic output. Note: brands may vary. Photo is for reference only and may not exactly represent final product received.