Preamps with balanced ins/outs and remote

I understand the Zesto Leto has an input transformer coupled with an output transformer. Is this a variation of balanced and does it retain the advantages of cables with respect to impedance?

With respect to cables, yes, its possible. A lot depends on the design of the transformers. If they are designed to be loaded with the relatively high input impedances that are common in amplifiers today, you will retain the Common Mode Rejection numbers but otherwise the construction of the cable will have a big difference on the sound.

The balanced line system is designed to eliminate cable artifacts! So some output transformers are designed to drive a low impedance (600 ohms being the standard). If the transformer is driving this impedance you insure that the cable is not influencing the sound at all.

Electrocompaniet makes a couple of preamps that are fully balanced and have standard or optional (fancy) remote controls.

I have always loved the EC sound - the punch of SS combined with the smoothness of tube. For some, the looks (perspex and gold) can be a turnoff, but they now make optional silver faceplates.

It recently discontinued a couple of models and released a new preamp, so there may be some demos for sale at dealers.

Certainly worth a listen.

One choice could be Mark Levinson 326s.