First off, given the age of the amp you may wish to replace the filter caps in the amp. Allowing an amp to sit for years is not good for the electrolytic caps. Regarding the IC based unit; it is possible that the IC based input circuit is still capacitor coupled. It would be interesting to see if there may be a new IC that may sound better and run quieter then the one in there. I would suggest installing an IC socket in that case. Interesting that it would use an IC as the Citation 12, the amp designed before the 16, had a discrete input that utilized a bipolar differential circuit. I believe that was the first amp to use that circuit topology. If I'm not mistaken it was designed by Matti Otala. It also was one of the first solid state wide bandwidth amplifiers ever designed.
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