Craig,
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Interesting that you had trouble with that particular IC. So did I, on my low-SN TR-7.
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I replaced with a CD4066, as that's what I had to hand. The 4066 is a somewhat improved version of the 4016, as I recall. I put the replacement on a socket, just in case I ever have to go there again;-)
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Regards,
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Mark, G4FPH.
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