Insert jacks

I just put insert jacks on my ‘things to check first’ – list. A couple of days ago I repaired a Soundcraft mixer, after disassembling it and figuring out the signal path (didn’t have schematics) it turned out that the contacts on the insert jacks were corroded disabling the signal flow.

The very same problem just occurred in an audio amplifier whose headphone jacket had the same problem leading to a defect left channel.

The importance of battery change in korg polysix synths

Picture by Cicciostoky

The Korg Polysix is a great Synthesizer and well known for its beautiful strings and pads and for its fat basslines (just to name a few possibilities). The effect unit features three independent delay lines which are modulated by a special kind of LFO with three sines 120° apart from each other.  The “ensemble” setting makes use of this possibility and creates a unique dense sound which you won’t find in any other comparable synthesizer.

It’s also possible to modify the Polysix a future article will probably cover the possibilities here.

Unfortunately more and more Polysix units end up broken, because the battery needed to keep the internal memory tends to leak when it get old. The battery acid destroys traces on the PCB, ICs and sometimes even the processor. It often takes a long while to replace the broken parts and restore the broken traces.I already repaired three Polysix’s with this problem and one of these was actually a total loss, because repairing would have cost more than the price of a new Polysix (that was a few years ago when a P6 was about 200€).  (btw. I repaired it nevertheless, I just love these synths^^)

so please:  If your Polysix still has the original battery please change it or get it changed!!

It is a standard procedure and costs about 30€,…or you just do it yourself. Old Crow has a detailed how to.

It is a real shame with every Polysix that is broken beyond repair.

The picture shows some fixed traces in a Polysix, luckily this unit  was not destroyed badly and it was possible to fix it quite fast.

Midi for Acetone Rythm Ace drum machines

we now offer to add midi input for Acetone Rythm Ace and similar drum machines.

contact us for details and prices.

An example: This is a Goya Melodic Rhythmer an analogue drum machine built into a guitar amplifier case. But is is not only very similar to the Acetone Rythm Ace, it also uses the same PCB ! So it is basically a RythmAce for cheap (but sounds the same).
The picture shows my own unit in my studio, it has been modified and now has midi input. Also the original lights at the front had been substituted by bright red LEDs. The downbeat indicator now blinks in sync with the midi clock.