World’s First Variable-Voltage Tube Control

World’s First Variable-Voltage Tube Control (PATENT PENDING)

We’ve added a switch on the power supply that sags or over-supplies the main tube voltage. You could think about it like Eddie Van Halen’s “brown sound”, but for a mic.

A typical mic with this style of circuit will operate the tube between 65-80V. With the Variable Voltage Control located on the power supply, you can adjust the tube’s plate voltage between 34-105V. This changes the parameters of how the mic operates:

• Total Harmonic Distortion
• Transient Response/”headroom”
• Frequency Response
• Output Level

This makes the V14 even more versatile, allowing the engineer to find settings for ideal musicality. We’ve noted the “standard” operating points with larger marks on the power supply so you can use the mic at it’s traditional operating point. We laser-engrave a handy chart on the bottom of the PSU for the engineer’s quick reference, and the makeup gain required is listed on the switch positions to keep your levels optimal.

Oversupplying the tube will increase odd-order harmonic distortion as it pushes the Cinemag output transformer, as well as increase output level.

Undersupplying the tube will increase even-order harmonic distortion and reduce output level, as well as reduce “headroom” and change the way the mic reacts to transients.