Regulated source. e,g. for reliantly testing all bare ESL panels like Quad, B&W, Shackman, Acoustat, Martin Logan. Ideal for any new ESL loudspeaker under test , e.g. for finding the corresponding stretching force to a given electrostatic field strength and vice versa.
Undestroyable. Solid state Tube driven with absolute constant voltage and current. Industial, scientific and military standards.
New tubes. Attenuation in 1/10/100/1000 Volt steps, reverse polarity switchable. Best for precise surface resistitvity measurements under high voltage conditions in conjunction with a Pico-Amperemeter (Keithley) and eventually an appropriate probe like the one and only Keithley 6105 Resisitivity adapter