MATRIXSYNTH: The Human Comparator 73-75 Serge Homebuilt w/ Custom Expander

Thursday, July 04, 2024

The Human Comparator 73-75 Serge Homebuilt w/ Custom Expander

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via this listing

"This instrument is tons of fun, and also is a seriously customised build. I bought this kit years ago and have been slowly assembling it. It works in full, and unlike many specimen out there, is very compact while being equipped with a spring reverb tank. I recorded two albums on it in its unfinished state, then had it dust up for a bit, but now it's fully finished.

It received the following customisations:

A halfpanel expander (the black strip) has a DC offset generator, noise source, inverter and an output summator - 3.5mm mono output on the right side. This expander implements some functions that are not there or will save you an entire voltage processor half.
As a finishing touch, there's a fully powered breadboard for you to try out some stuff on. It has +-12v and ground broken out to it, so active circuitry is a possibility.
I built a custom linear power supply for it - its regulators are short-circuit protected, so the breadboard is somewhat foolproof.
There's a long ass bank of decoupling capacitors on the lower panel, ensuring smooth and quiet operation. So far it has been remarkably fine, and has greatly reduced the voltage processor bleedthrough that many people on the 73-75 group have experienced.
The reverb and preamp circuits have been replaced by entirely custom circuitry attached to the upper panel; the original ones were too noisy for my liking.
The jack color scheme is a standard Serge one instead of the THC-proposed faded old-styler colouring
The 3.5mm~banana converter banana jacks output ground if the 3.5mm part is not used, making them ground references.
Will ship more or less anywhere via Estonian standard post double-boxed and with tons of filler; other carriers = add'l cash. I will throw in some shorter banana cables, too. This unit runs on 15v AC (not DC!) - i can help figuring out a suitable brick for you to buy in place, as mine is european standard and my only one, so i'd like to keep it.

My camera is not of best quality, so a hi-res reference can be found on the kit producer's website ( to see which exact modules are there."

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