First real remote control preamp I would say was a real nice preamp would be an Audio Research LS15. No balance input or outputs but I’d say it was as good as anything back then. LS5 MKII had a remote option and is an all balanced preamp but probably a lot harder to find. Can’t think of any preamps before these with remote that is close to the level of these but maybe there were.
Sonic Frontiers Line 1 has balanced and a remote.
Sonic Frontiers Line 1 has balanced and a remote.