No, it's where you can use a 9v battery to provide a bias voltage for the output stage in lieu of the zener, as that was fashionable when the original Pearl was published.
Leave it empty.
Leave it empty.
Original Pearl phono pre comparison
Links to some tests of the Pearl phono stages, along with other popular phono stages:
Original Pearl
Eros
Bellari VP-130
Hagerman Bugle
Modified Hagerman Cornet
Yaqin MS-22B
Cambridge Audio 540P
Musical Fidelity VLPS
Parasound Z-Phono
And for comparison, the phono stage of a Conrad-Johnson PV10a preamp
Links to some tests of the Pearl phono stages, along with other popular phono stages:
Original Pearl
Eros
Bellari VP-130
Hagerman Bugle
Modified Hagerman Cornet
Yaqin MS-22B
Cambridge Audio 540P
Musical Fidelity VLPS
Parasound Z-Phono
And for comparison, the phono stage of a Conrad-Johnson PV10a preamp
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