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The + on the C7 electrolytic goes to the cathode (pin 1) as shown. If you check some other ratio detector circuits you'll see this also.
Tube pin numbers always go clockwise looking at the bottom of the tube starting from the space on minis or from the key on octals and loctals or in the case of large pin tubes, from the large pin on the left with the large pins at six o'clock.
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Reece
Perfection is hard to reach with a screwdriver.
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