MATRIXSYNTH: RSF Kobol Expander Modular Synth System 1978


Friday, December 13, 2024

RSF Kobol Expander Modular Synth System 1978

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Pics of the inside below.

"Up for sale is an extremely nice clone of the RSF kobol expander 1 and an original RSF kobol expander 2. The clone is made with original SSM chips for the filter and envelopes and original ua726 for the oscillators. I was able to tune it up so that the knobs match my original expander exactly and it now sounds 100 percent identical. It also runs off of 18 volts and is even slimmer than the original. This expander alone would make a great travel synth.

I had plans to make new faceplates and build a travel case for these guys but I have too many projects going on right now. It’s a great oppurtunity to get these two for a bit cheaper than what they have gone for in the past. The expander 1 is simply the best bass synth ever. Super snappy and great for leads as well. The behringer and moslab clone both missed the mark in my opinion. There’s something very special about the wave shaping of the original and I was amazed that I got the clone to imitate this behavior exactly. The ringmod on the expander 2 is really interesting/ dirty pairs well with the wave shaping. Be careful with purchasing kobols as there are clones out there. Always ask for inside shots of the units. I A dead give away is usually the switches.

The expander 1 is in perfect condition. The expander 2 has a slight dent on the corner that was not noricable when racked and the faceplate has a few scrapes. Both are in excellent working order with no scratchy pots or anything."

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