One month ago, before I started the project, actually I bought bunch NOS preamp head tape kit, and desoldered it and rebuild with your schematic with prototype pcb. After everything working nice, I go back to the wasted PCB that had been desoldered out, and I try to adapt the lay out with the new schematic. Its not easy but worth to try rather using prototyping pcb or make a new one. And I did it, not even cut any trace.
A weeks ago I study what really opamp is and how it works, Then I thought the head tape kit, must be a preamp too, why dont I use that preamp and tweaking it. it would be more efficient using the actual design rather than re design it. so I go back to the head pramp kit I bought before. Then I found the head tape preamp schematic different with the opamp theory I got ( I learn from Dave Jones EEV blog ). The last schematic I upload is from the actual head tape preamp I bought. After searching trough internet what inside LA3220 is, I found PC1 adn PC2 are connected to the output of the opamp. Its makes me confuse, I dont think that pin 3 and pin 12 is GND, since it on pin 1, right? But Im not sure.