<div dir="ltr">I am not asking about quality; I know the colors have nothing to do with quality and that binning is concerned with parts-matching.<div><br></div><div>So two BA662A marked in blue have a very similar "gm" measurement to one another; ditto two which are marked in yellow... but a blue one might not be a good match with a yellow one... I'm clear on the basic concept.<br><br>Just wondering if any Roland service info decoded the color code in terms of what numeric ranges they were measuring when binning these components.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Feb 7, 2016 at 9:05 PM, <span dir="ltr"><<a href="mailto:rsdio@audiobanshee.com" target="_blank">rsdio@audiobanshee.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">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.<br>
<br>
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.<br>
<br>
Hopefully there is more information somewhere.<br>
<br>
Brian<br>
<br>
<br>
On Feb 7, 2016, at 5:26 PM, Amos <<a href="mailto:controlvoltage@gmail.com">controlvoltage@gmail.com</a>> wrote:<br>
</span><span class="">> 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" :<br>
><br>
> <a href="http://yusynth.net/gear/ROLAND/R100-schematics/M-140-sch.pdf" rel="noreferrer" target="_blank">http://yusynth.net/gear/ROLAND/R100-schematics/M-140-sch.pdf</a><br>
><br>
> However, I've found no indication as to what colors correspond to what range.<br>
> 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?<br>
><br>
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