The color of the casing of the potentiometers just isn't convincing enough. I've had plenty of batches of electronic components (boxes of 100 or more) from the same manufacturer where they switched between batches and one an a while mid lot. It'd really be great if the manufacturer would provide a definite test. Please do let us know what turns up and if you do get a good unit feel free to post a link for the vendor. Not a lot of call for these in the MKIII community but it wouldn't hurt to have a known good source.
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