Tube Preamplifier

Description

bought brand new n light use on rotation with other preamps Driver tubes re 2 x 6SN7 Rectilfer tube is 1 x 5z4P added feature, Voltage Regulator tubes, 2 x WY3P all tubes, factory supplied another special feature, a Ground Switch, maker says for a situation where there is a hum issue. in my setup i didn't have to use it.