I've been looking for a stepped attenuator for the ST-70/ST-120 that was small enough to fit into STEREO/MONO switch area. I finally found, through one of my distributors, a 21 step attenuator that fits the space and works well. This is a 100 Kohm unit with sliding steps and no "click" or any noise at all between the steps. It works extremely well. The black knob compliments the black tube sockets on original Dynaco amps or my kit amps. This attenuator will be great if you only have a single high level input source like a CD player because now you don't need a preamp at all. Another nice feature is that you CAN also use this WITH a preamp. On the final 21st step there is a complete pass through of the signal with zero attenuation. If your preamp has a volume control that has the volume come on too quickly you can use the attenuator as a "master level" control for your amp.
I will probably be offering the stepped attenuator as an option with the kits and wired amps that I sell in about 2 weeks but the attenuator may be used with any Dynaco ST-70 amp. Right now I only have one extra attenuator/knob set but I will be getting some more later next week.
Last edited by Bob Latino on Sat May 22, 2010 6:30 pm; edited 1 time in total