Companion of the C-06 and penultimate peak of the Alpine years, with the DP-07, DA-07, M-06 and M-07. The ultimate peaks would be the revised "alpha" versions of the three 06.
The E-06 is a step-up amp with CR phono stage built amazingly well with two toroidal transformers and two Ultimate Attenuator 32-steps fixed-resistor arrays for the variable outputs.
Circuit-wise, a back switch allows to take advantage of the C-06 balancing of the unbal signals ; two separate constant voltage power-supplies feed all.
The actual step-up transformers are four, two of different kinds (two for the above-mentioned signal balancing), and were custom designed with PC-OCC wiring and particular attention paid to core overlapping, shielding and wire diameter.
Other parts are equivalent to those of the C-06 : copper-encased toroidal trafos, epoxy PCBs, separate +/- rectifying circuits, non-magnetic chassis, nitrogen-gas gold-plated relays, copper-shielded hardwood enclosure (and everything else) and line-phase sensor.
Upgraded as E-06a in 1990 : the perfect one which sold... better !
A real E-06 here ; nudies and oscilloscope graphs aplenty (including of the smiling attenuators) at the indispensable amp8.com.