The problem with 3-500Z's was/ is caused by insufficient cooling of the
tubes. Some amps even use a muffin fan on 3CX800 tube amps, which, according to
Eimac's spec's are to be cooled by a blower, not a fan. Big difference !! A
muffin fan can not build back pressure like a blower. A muffin fan will not
move
any water in a manometer !! The manufactures, know what they are doing is
wrong but the heat related problems don't usually rear there ugly heads until
years down the road. Use chimney's with a blower when building an amp. It
cost's more initially, but pay me now or pay me later !! Willy K3VW
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