Other Designs

There were several EC designs made between ‘75 and ‘80, in that first period. Several of these never made it into production. On the pages in this section, details of these designs are given, as far as we have been able to recover them: some schematic details, some of the story behind them and the reasons for their development, and some technical goodies — and possibly a hint or two.

Among these: the “Regulated 25W” amplifier, which had regulated power supplies for both the pre- and power stages — it did away with all the ripple, and provided high-speed power to the amplifier. It sounded good! But the heat …

Also the “May ‘78” preamplifier, and the “School Amplifier”, which wasn’t really an EC design — it was a school project sponsored by EC, using EC components and instruments.

The “Krinken” preamplifier

In 1977 we were approached by the Norwegian Broadcasting Corporation — Norsk Rikskringkasting (NRK) — and asked if we could develop a professional preamplifier for studio work. It was to have differential input and output. To us, of course, that meant no transformers. The electronics were completely differential all the way through. The preamp had passive equalization, a lot of transistors, and sounded very good.

(The schematics for this one were never relocated — if they turn up, they’ll be added here.)