crazy rare all discrete mixer from 1973 The Heil HM 88 was built about 1972. It was modular so you could purchase the number of channels you needed - up to 8. Blank panels covered the unused 'slots'. It used, 3 pin XLR balanaced inputs as well as an unblanced 1/4". It had a three position slide siwtch input pad. A monitor send that could be switched 'pre' or 'post'. Using concentric pots, the bottom one was monitor send with the top being an aux send and of course you could use both as monitor sends. I designed a two band shelving EQ for each input channel.
The output panel had a two way electronic crossover with line driver. Also had a monitor and auxiliary masters. The meter was a very high quality VU meter. The HM 88 had an internal power supply. The mixer came in a tolex covered case.
It was our first production product that was built 'By Those Who Care In Marissa, Il'....and WAY ahead of it's time. The HM 1000 followed this and used much better technology. Outboard DUAL voltage power supply, Integrated Circuits, Stereo output with Pan post on each channel. This was the mixer with the cast zinc panels. THe HM 88 has anodized Purple and Blue aluminum panels.
