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It's why I removed all the covers on my Sherwood, and run my 400 sans cover, too.

Posted by ToddM (A) on January 25, 2024 at 10:19:16

In Reply to: My new theory about longevity posted by ltman on December 20, 2023 at 10:08:06:

The compact chassis design and layers of "heat shields" (not the tube shields, per se, which are only on the preamp anyway) made for a pretty hot amp after a few hours. Even after getting things tweaked to spec. and running MUCH cooler (e.g., at the PT), the cover over the output tubes gets really really freakin hot and blocks air circulation.

Fwiw, I was once told that all those covers/shields are actually "heat sinks for the tubes." I questioned that but the dude was adamant. Anyone have an opinion on that? I mean, there has to be some radiation off/out for it to truly work as a heat sink, right?

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