Depends. Some run whether needed or not. If not then simply disconnect it. My Dynaco was like that, a simple socket mod let me leave it unplugged most of the time. Usually need to be driving them pretty hard to really need a fan. If it really is needed then remove it. Hopefully find something with a part number on it. Because unless you are lucky enough to find its a simple clean and lube then its gonna be replacement time.
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?