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Another technique if you don't want a big power resistor dumping heat under your chassis is to put multiple Silicon diodes in series. I've read that selenium rectifiers drop around 1V per plate( and are effectively a stack of lower rated selenium PN junctions). Silicon drops .7V per plate.
If you are working on a very power hungry set like the nearly 40 tube CT-100 make sure to use 2.5A diodes or make sure there is at least 2-3 component body's worth of lead separating each diode to allow for heat disapation.
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