Not quite. I think you had the opamp pinout wrong. Looks like the signal comes in from the film coupling cap on the right via R20 (1k) and sees 30k (R19) from the noninverting input to ground. The remaining circuit is it's a noninverting amplifier with Rf = R17 = 30k from output to inverting input and Rg = R18 = 10k from inverting input to ground (values are a bit high for my taste, btw, those would contribute about as much noise as the opamp itself).
BTW, it's a good thing the OPA2604 is socketed, on +/-12 V it generally is not a particularly good performer save for RF immunity.
Assuming my reading of things is correct, you could put in like 1k for R17 for near unity gain. For the opamp, something not too fast and generally well-behaved would be advisable. I might try a lowly NJM4560, 4565, 4580, or 4556A. Less sure about the FET input side of things, maybe AD712? AD8620s are also nice but would require an adaptor board.