Best temperature for optimum tube performance


Is there an optimum temperature range in which tubes perform best?
I've been running tube amps/preamps for over 40 years and have always placed a small, quiet fan in front of them to prevent excessive heat build-up (a modified, two-door antique silver cabinet is where they reside).
I'm aware that electrical resistance increases in proportion to increasing temperature, but am I somehow decreasing the optimum performance of my tube components with this strategy?
128x128rettrussell

Showing 1 response by petg60

Why fan at the front and at the back where more heat would be injected out from the cabinet?
Output tubes and even signal ones produce considerable amount of heat stressing close by components like caps. If you cannot move equipment in open air then what you did is fine but it is difficult to tell if the cooling is uniform.
All tube spec sheets provide data at a specified ambient temperature. So if within that temperature they should work as intended.

G