Fredenstein Bento 8

Bento 8 features a complete linear power supply consisting of a
mains transformer and linear regulators. This topology yields
the cleanest power to your modules. Usually linear power supplies
can't deliver high output currents, but Bento 8 outputs +/-16V DC 2A
and +48V DC 0.25A, 500mA per slot, that's ample power for the most
demanding 500 series modules! Another drawback of linear supplies is
that they are prone to introduce hum from the mains transformer directly
into input and output transformer inside modules, especially when plugged
into the slot closes to the supply. Bento 8 incorporates
extensive shielding of the mains transformer to eliminate induced hum.