Are there good sleeve-type tube cooler things if I have my tubes on a shelf with not too much top clearance above the tubes? Thanks in advance. (I am just talking about preamp-type tubes, like 6NS7s or 12AU7s.)
Laptop fans will do the trick, especially with a wall wart power suppl. These usb powered fans, often available for $5 would be the first stop. Most are pretty quite and you can add a few to get the air flow you need in all areas of the amp. I've done this and it works well.
Check out Parts Connexion. They sell these Pearl Tube Coolers. In discussing with some folks a few years back, it was recommended to add some grounding cable from each of these to the chassis to drain any static that could occur.
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