The May '78 Preamplifier

Details on this preamplifier will be added over time. First, the line stage — the specifications achieved are shown below:

May ‘78 preamplifier, line amp specifications May ‘78 preamplifier, line amp specifications

May ‘78 preamplifier, line amp schematic May ‘78 preamplifier, line amp schematic

The design was made very similar to the “Otala” designs. It was a single-power-supply design — note the input and output capacitors. It was designed to replace our old, completely single-ended preamplifier, which was never a big hit.

At Electrocompaniet this preamp was named “Model II”. It was designed in the period January to July 1978 — I don’t remember why it ended up being called the May ‘78 preamp.