Invader Jima wrote on Apr 30th, 2013 9:31pm
Most of these had a 15k resistor on pin 3 of the IC but mine has a 16k here. All resistors except the 16k are metal film types and the pots' date codes are a year apart (1981 and 1982). This leads me to believe that this is actually a very early Dunlop-made unit circa 1986-87.
My unit is all-original except for the IC (originally an RCA CA3080E, now a Harris CA3080A metal can-- they sound identical, unlike the new CA3080E plastic DIPs). Also the original wiring had to be replaced and the old foam was rotten and had to be removed. The reason I replaced the IC was they put the socket in backwards at the factory so after cleaning out the foam I put the chip in backwards and fried it...