PMT V-Treb Variable Treble Bleed Circuit Violin Books and does not require batteries

and does not require batteries or phantom power

Unfortunately the the serial number is on the jack plate and it has been replaced

Length: 1-13/32" (35

This single cone

PMT V-Treb Variable Treble Bleed Circuit Violin Books and does not require batteriesPrecision Music Technologies V Treb Variable Treble Bleed Bypass Circuit. Made in USA. The V Treb Variable Treble Bleed Circuit attaches to the bottom of any volume pot and corrects the problem of high frequency losses at reduced volumes by allowing the player to control how bright or warm the tone will get as the volume control is reduced. Turning the trim pot clockwise increases the amount of treble bypass for a brighter sound at reduced volumes.