"Is there anybody who measured offset voltages is a TS circuit for various opamps, including those 4558 that is raved about? (I don't have one)
Another thing to know about the RAT/LM 308 is that it is driven into perfectly symmetrical distortion. It's a precision type.... "
Well, I think RG is going to have a field day with you guys on this topic and my only comment is about the Rat. Whether LM308 or 4558 will make no difference since you are applying a similar reference voltage to the + input of both opamps - not to mention that both ends of the feedback resistor will be at the same dc voltage because the - input is ac coupled to ground.