Korg PS-3300



ps3300We’d been looking for a Korg PS-3300 for a while and finally bought one from a nice guy in Europe.  Crating and shipping costs were pretty significant.  And then there were the import taxes.  It’s currently being restored by tonetweakers, who will also be adding a Kenton MIDI retrofit to it.

ALL early Korg PS and MS series instruments need a massive overhaul at this point in time.  Their capacitors leak and destroy circuit board traces.  Damaged traces need skillful repair.  Whatever tech was inside this machine did a half-assed repair at best, so Tone Tweakers needed to redo his work and do the tons of work that should’ve been done but which he didn’t do.  All card edge connectors needed replacement, and then there were a bunch of other challenging problems that needed to be sorted out.  As of now, about 90 hours of time and a lot of money have been invested in its restoration, but it looks like it’s almost done and, in the end, it will have all been totally worth it!  We can’t wait!

This particular PS3300 appears to be one of the earlier ones.  The knobs have metal rings around them, like those on the Korg 770 mono synth and older Korg Minipops drum machines.  The front panel design and layout are slightly different, and there are more spelling errors on this ones front panel than on later units.  The PS3300 basically consists of 3 PS-3100s.   This specimen sounded quite different from the PS3100 in our studio as well as a friend’s later 3300.  The filter just wasn’t as bright and the lowpass filter’s resonance wasn’t as deep.  The amplitude modulation was also rather weak.  It turns out Korg made some changes somewhere along the line and used different op amps, different value resistors, etc., so we’re also having this unit upgraded to sound like one of the later units as they sound way better to us.  We are also performing a few other reversible modifications, including adding the ensemble effect that’s in the PS-3100 but not in the 3300.  This 3300 has an ensemble circuit board, but it’s unpopulated, so the parts have to be ordered and installed, and then the circuit needs to be wired up.  We’re going to connect the in and out to the bottom two junction jacks, and will use the other junction jacks for other stuff, like outputs for each module’s 2nd LFO, which are present on later models but not on this baby.  We’ll also turn one of the two sample and hold outputs into an input.

If you’ve got a PS-3300, we would love to hear from you.  We may actually want to buy another.  contact (at) thesynthsanctuary (dot) com

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