I used to be a Naim owner in the 1970s & 80s, (22 120, 12 160, 32.5 Hi-Cap 250) I know that Naim said not to use with Electrostatic Speakers.
I tried one of the small Naim Pre / Power combinations on a pair of Electrostatics in the 1990s (not Quads), the Power Amp closed down in less than one minute)
I do not know when, or if this changed. I would not try unless I contacted the Naim Factory with Serial numbers for their opinion.
Strange really because Naim were trying to manufacture a full range Electrostatic Speaker, I heard a prototype, very, very impressive.