Tube coolers?

BTW, the fan I linked to above is rated 8.7 db. That's pretty quiet.

Thanks everyone for the advice. I am trying to place a pair of 6NS7s in a space where there is only about 3-quarters of an inch to 1 inch from the top of the tube to the shelf above. (The rack is open on all 4 sides, though.) So I will give the Pearl coolers a try and see what happens, and try a fan later if I need to.

I am not sure how much heat 6NS7s generate, as I have not used them before. (I have some 12AU7s in a headphone amp that are pretty cool, so I was hoping the 6NS7s were cool also.)

Herbies tube coolers are very nice. I use them in all my equipment to get rid of heat from my tubes.

Http://www.herbiesaudiolab.net

And he and his wife are nice people to boot...Can't beat that and his prices.

I ran across this old booklet while looking into the subject of tube coolers.

Very interesting reading about tube reliability, but fairly technical. It does seem to suggest that cooling the glass is very helpful, but only mentions blowing air on them as a strategy. It's amazing how much has probably been forgotten about tubes :)

Thanks again for that, and especially to Auxetophone for that great book! I really appreciate that great find.