Resisitors for Tube Electronics.

Are all resistors created equal?
When it gees to resistors for tube radios and tube based electronics, all resistors are not created equal.
Unlike transistor based electronics, tube electronics (tube radios, tube amplifiers, tube televisions, tube jukeboxes, tube ham gear etc.) require resistors that can handle high voltages and withstand very high temperatures. Resistors that are suitable for transistor radios may not be suitable for use in your tube electronics. When selecting resistors for tube based electronics....in addition to getting the correct ohm value and wattage.....it is important that the resistors have a voltage rating that is high enough. The original carbon geposition resistors in your tube radio most likely had a working voltage rating of 350 Volts. When replacing old carbon geposition resistors, it is important that they be replaced with resistors that have a working voltage equal to or higher than the original resistors. If lower voltage resistors are used....there is the risk of failure.
Many modern day 1/2W resistors made of metal oxide, carbon film, metal film, etc are rated at "less" than the required 350 volts. Also, almost all types of resistors manufactured now-a-days are manufactured with either "small" size bodies or "normal" size bodies. Cheaper "small" body type resistors have a lower working voltage than their "normal" body size counterpart. The "small" body type resistors (which are almost always rated at less than 350 volts) are fine for most transistor radios....but they can not handle 350V. If you are restoring tube based electronics "small" body type resistors should be avoided. Many traditionalists like to replace their old off-spec carbon geposition resistors with new carbon geposition resistors. If you replace old 1/2 watt carbon gep resistors with modern day resistors, be sure that they are "normal" body type and are rated at 350 volts or higher. To "play it safe" many enthusiasts that repair/restore/build tube radios and electronics replace 1/2W carbon geposition resistors with modern day 1 watt "flame proof" resistors....a practical choice.