A comment that uses extreme brevity and a hint of irony is a "micro crack". Also, fans have been cooling tube amps in one way or another (suck? blow?) seemingly forever, and this is the first I've heard of micro cracks...I'm suspicious...I'm going to be looking for these everywhere now..."Hold still Marge...you could be standing near a tube with MICRO CRACKS"...
Looking for Silent Fan Cooling f my ARC Tube AMP
I have my ARC tube amp in a corner. I like to stick a fan behind it . The one from radio shack worked great but made a little noise. Any suggestions . Thanks to all !