• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

All triode no feedback direct drive for ESL

Dear Group,

As far as I know, there have been exactly two efforts to commercialize direct drive amps for ESL's: One by Acoustat (Acoustat X) and one by Beveridge. Both companies dissolved for a time afterwards. They are/were both back recently.

Now, in this context, who can inform about a certain "Kimmel all triode no feedback amplifier" for use as a direct drive for an ESL? Any leads? Info? Who's Kimmel?