This has just made me realise that valves need kickass looking heatsinks!
I am definitely intrigued by these.
These are quite cool.
http://www.pearl-hifi.com/03_Prod_Serv/Coolers/Coolers.html
Groan :roll:
I'm not convinced they're of much use for most applications, but I reckon in an AC30 they could be well worth a try with all that heat in the chassis.