Dwarf recording amplifier made in California – made 1974 which is the date of the ad below from eBay.

The Dwarf claimed to be the first low noise portable recording amp with “F.E.T. I.C. Electronics which give a clear tube sound with solid state reliability”

These amps were portable and battery powered.

Images from eBay:

Dwarf amp

Dwarf amp battery compartment

Dwarf amp inside