Thanks, bregez. After my original post I discovered the Search feature of the forum and found some personal experiences and suggestions relating to my questions.
My main point of uncertainty has to do with the input amplifier. My understanding is that FET input op amps are more resistant to radio frequency interference than bipolar input op amps and have a higher input impedance (useful for high source impedances). Bipolar inputs, on the other hand, generally have less voltage noise but higher current noise. I am not knowledgeable enough to predict the relative performance of the OPA2134 and the LM4562 in the input position of the original Bugle, thus my questions here.
One of the posts I found in my search said that Jim Hagerman designed the EQ of the circuit around the OPA2134 characteristics, so is it best to use that specific amplifier? Perhaps Jim could comment on this question and the relative merits of of the two op amps in the original Bugle circuit, and if anyone else can offer some useful information, I would appreciate that also.
