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How hot is too hot?

Posted by vinnie2 on June 2, 2017 at 16:22:14:
Got the filaments all burning at about the same brightness on the new 813 amp by changing out one 813, so I guess the one it replaced had a filament with lower resistance and made that side burn brighter. But now it appears there is another issue. I ran the amp for several hours this morning and it just kept sounding better and better, but remembering all the resistors under the hood I decided to see how hot things were getting. After several hours of playing the top plate was too warm to keep your hand on comfortably for more than a few seconds. It has not caused any apparent problems so far, but it makes me wonder; what is the maximum temp the other components under the hood can handle longer term? I did some spot checks of the top plate with my laser thermometer, and it varied from about 110 to 125 degrees F. Definitely hotter than any other amp I have ever built, but I don't know if I have ever seen any numbers on max temps. Anyone out there have data? I don't want to install a fan unless I have to because of the noise. The amp will be only a few feet from my listening position.