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Most tube and lightbulb burnouts are on initial turnon surge. Today probably nobody is going to complain about warmup time (how would most people know what's normal with a tube set, having no experience with tube equipment?) and saving the tubes is important now with no more being made, even though there are still lots of them around. You could put in a 50C5 anyway and thus run the tubes on a little lower voltage with the resistor still in, and the tubes would be happier still. I usually put in a CL-90 inlet surge limiter in sets which slows things down a little (20 second warmup) and cuts a couple of volts off the line voltage, which is generally a bit higher now than when these sets were young.
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Reece
Perfection is hard to reach with a screwdriver.
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