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One weird thing I sometimes do to approximate the selenium voltage drop in some sets is to replace 1 single section selenium rectifier (yours is a dual section rect) with at least as many diodes as plates connected in series. Selenium's have around 1V forward drop per plate and Si diodes have .7V per diode so connecting series So diodes can approximate the effect....If you ever do this make sure to leave as much space between new diodes as possible or mount them to a terminal strip. When you connect more than 4 in series the center ones get hot and I've had a center diode burn open once before(the rest were fine and protected the set).
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