Marshall Electronics MXL V76T Tube Microphone with Power Supply, Case and Shock Mount. The Marshall Electronics MXL V76t Tube Microphone follows in the footsteps of the highly acclaimed MXL V77S. The V76t is a large diaphragm (1") cardioid condenser mic with a 12AT7 tube amplifier circuit. It has a transformer coupled balanced output and has a smooth solid midrange perfect for vocal recording. Frequency Response: 30Hz – 20 kHz. Housed in a silver flight case the microphone comes complete with tube mic cable and hi-isolation shock mount.