Discussion about the Korg PolySix synthesizer

Hi folks,


  My batch of proofing boards for the replacement KLM-367 showed up last 
Friday. so I spent Sunday putting one together:

http://www.oldcrows.net/~oldcrow/synth/korg/polysix/crowlm367/Assembled_CrowLM-367.JPG

http://www.oldcrows.net/~oldcrow/synth/korg/polysix/crowlm367/Assy_closeup_367.JPG

  I put it in my test machine, and it ran fine, even uncalibrated.  The 
knob resolution was a bit off, but when I calibrate the DAC and LFOs 
things should be right in spec.

http://www.oldcrows.net/~oldcrow/synth/korg/polysix/crowlm367/Crows_klm367_in_p6.JPG

  FWIW: I salvaged the 8048, 1K tempco resistor, dual matched PNP pair,
the two socketed LM13600s and the seven connectors from a basket-case
original KLM-367. On the next one I build I know now what I can substitute 
for the old Japanese transistors and as well I can just use TL072s in 
place of 4558s.  (In 1981, '072s were rather expensive; nowdays, they are 
cheaper than 4558s at around 22c per).

Crow
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