I also made this design in Eagle, and created a one layer PCB, if anyone is interested.
I've also replaced a few components so the preamp is more accurate according to the RIAA curve (thanks cogsncogs!). The PCB size is 72.06mm * 41.6mm and includes an AC rectifier circuit and two voltage regulators (+-12v).
Cool!
Based on other research and advice I have received, it would not be a bad idea to add a ceramic bypass cap (0.1uF or 0.2uF) between opamp socket pin 4 and ground, and also between pin 8 and ground, especially if you plan to "roll" various opamps in that socket.
I got some bypass caps (0.1uF) right at the two voltage regulators!
I see that now.
Note: I have read several places that proximity to the IC is critical.
For example (C8 and C9):
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(apparently png will not embed) RJM Audio - Printed Circuit BoardsAn externally hosted image should be here but it was not working when we last tested it.
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