Can Tubes be too cold?

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

My three channel crossover is developing crackling sounds that seem to be tube related. I ruled out bad resistors. The reason I ask is the crossover is at the top of a forced air thermal thermal chimney in a rack with three KT88PP and three 6V6PP amps under it. To spite that heat the crossover tunes directly under two biscuit blower fans are abnormally cool - no heat to the touch.
Can tubes start to fail from being too cool?
P.S. The tubes are EH 12AX7's four per channel. The bottom of the chimney has a small furnace blower feeding it. There is plenty of airflow, perhaps too much>

Edits: 10/09/08

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Topic - Can Tubes be too cold? - gusser 12:15:23 10/09/08 (6)

RE: Can Tubes be too cold? - Michael Samra 17:20:28 10/09/08 (0)

RE: Can Tubes be too cold? - twystd 15:33:46 10/09/08 (0)

RE: Can Tubes be too cold? - tubesforever 14:07:59 10/09/08 (3)

EH tubes - mikeyb 14:39:46 10/09/08 (2)

RE: EH tubes - Jim McShane 19:34:08 10/09/08 (1)

I have experience with the 6CA7 - tubesforever 13:36:30 10/16/08 (0)

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