Running a fan to cool amplifier any ill effects?

Thanks for the responses so far....the fans are on a seperate cicuit than my audio equipment. I checked out the noise level...not a problem. I realise that the amplifiers are well designed units....the transformer housing which is thick heavy metal gets hot enough where I can only heep my hand there for about 3 seconds. So to me I just feel better if the cooling will disipate some of the heat generated. If it extends the life of the tubes....even better...though it might seem unnecessary or overkill.

I hooked up the two whisper fans above the housing on the VAC 140's....about 5 inches above....the fans move a good amount of air and are 34db quiet according to specs. The 140's have a "tube sentry" which monitors the tubes. When they are initially powered up the 4 lights on the front turn green...which is good....as the tubes reach the correct bias the lights go off(normal). When the lights went from green to off...I then turned the fans on...in about 20 seconds a few of the lights went green again...on one amp a red light came on. I replaced that pair and powered the amps on again with no problems...but I did not use the fans.
I going to call Kevin and see why this happened. I could use a variac on the fans and reduce the speed to lower the cfm. I would like to cool these...but maybe the sentry looks at the tube temps or bias is affected by the tempature on the 300B....things are not as easy as they seem.

I contacted Kevin Hayes this morning and his suggestion was to run the fan air across the tubes. The air currently is cooling the resistors below the brass plate....thereby affecting the sentry circuit....makes sense. So I will configure the fans another way and direct the air away from the brass vent.

Thanks John....it's hard to beat tubes...especially VAC's. I love my modded Accuphase P300 but it's no match for the 300B VAC's....