[sdiy] Roland BA662 color code meaning?

[rsdio at audiobanshee.com]

I'm no expert on these particular parts, but in general "binning" only refers to matching, not quality. They're all potentially of the "highest" quality. I assume that you simply want to have all voices with the same color to keep your synth in tune and sounding like a proper polyphonic.

Reading the schematic that you provided, it seems that suffixes "A" and "B" refer to quality, with "A" being superior quality. I don't get the impression that color means anything about quality.

Hopefully there is more information somewhere.

Brian


On Feb 7, 2016, at 5:26 PM, Amos <controlvoltage at gmail.com> wrote:
> I have an assortment of BA662A here, and my reading tells me that they were tested and binned according to "gm" range, with matching color indicating similar "gm" :
> 
> http://yusynth.net/gear/ROLAND/R100-schematics/M-140-sch.pdf
> 
> However, I've found no indication as to what colors correspond to what range.
> I have parts marked in blue, red, yellow, and white, but I have no idea which colors mean "higher" or which mean "lower" or what the ranges are.  Do these data exist somewhere?
>