This is the latest incarnation of our resistor step volume control that can get to a fine adjustment of 256 steps ! It is an assembled kit, with the control done by a number of resistors and relays to complete the switch combination for minimal noise and distortion.
Low noise, low temperature coefficient mil grade 1% metal film resistors are used in the resistor network of the audio path for best sonic performance. ( Please do not confuse those resistors with low cost resistors)
The design is an audio level volume control, and either it is used as a passive preamplifier or it can be mated with ANY active preamplifier. We offer a number of preamplifier kits in our other auctions that can match well with this high quality volume switch. This is the most transparent volume control we have encountered.
Input Impedance : Between 1M to 10K, the frequently used levels between 20K to 50K
Output Impedance : 4K to 1M, the frequently used levels between 4K to 30K
(Note : This is a R2R type attenuator. Therefore the input and output impedance varies with position)
PCB Dimension : 86mm x 55mm.
Supply voltage : Dual AC 12V to 18V
Each board come with a 50K potentiometer to control a DC level for specific relay setting. Audio signal does not pass through the 50K potentiometer. It is for control purpose only.


