Fan on Amp Unbeatable


So, I have an older amp from the 70s. It's a solid state amp and the fan is so loud it's distracting. It's my first largest solid-state amp. I've been using tube amps for the last 15 plus years. I can't imagine fans are supposed to be overwhelming Lee loud. Has anybody else ran into this kind of issue and if so, how did you fix it?
pawlowski6132
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My home theater amp (Lexicon LX-7) has a fan.  I took it in for service for another issue and asked if they could put a quieter fan in while they had it.  It's much quieter now.  I can hear the fan if I put my ear within about a foot of the unit, but beyond that it's inaudible.  
Hmm will try some type of nose muffler first. Need to be careful of not allowing airflow. Any other solution involving opening the case will have to be done by my tech. $$$$. :<(
Go here:

https://www.acinfinity.com/

I’ve got a 5" side discharge on my tube pre-amp and it keeps it very cool. It has three speeds. On low you can hear it when you are next to it, but not across the room.

My SS amp has enormous heat sinks but I might put one of these on top of each one anyway.

The company makes thermostats for their fans as well.