> The dual -- CA3240 -- is in my old RCA book, but I have never seen > one. Would have been nice for my S/H bank. > http://home.earthlink.net/~ijfritz/sy_cir11.htm I've used it a lot. It makes a great buffer in OTA-based phasers, as it's high impedance and doesn't suffer from phase reversal as much as the usual BiFet amps. JH.