I've noticed that too, working with 1950's and 1060's gear. I've assumed it is due to the fact that line voltages are higher now than they were then, in many areas 120-125VAC now instead of 110-117 then.
Can't offer any guidance re "how hot is too hot," other than the fact that I haven't encountered any transformer failures so far in a moderate amount of experience with equipment from that period.
Regards,
-- Al
Can't offer any guidance re "how hot is too hot," other than the fact that I haven't encountered any transformer failures so far in a moderate amount of experience with equipment from that period.
Regards,
-- Al