Input transformer for most API circuit.
Was replicated from vintage 2622 transformer.

We spend a lots of time to find a best result and great sound.

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Turns ratio:
                 in parallel 1:7,5 (impedance 150:10K)
                 in series 1:3,7  (impedance 600:10K)

For PCB connection, 8-pin's bobbin.

Putted in MuMetal can.