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The end of the resistor body with the stripe is the + end. Start with about 50 ohms, at least 5 watts, and adjust from there. Sets with voltage doublers for the main B+ need a smaller resistor (typically 10-20 ohms, 10 watts) but I believe in this set that rectifier carries a smaller load. The added resistor simply goes in series with the diode, either before or after.
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