7:40 ace says that they changed the tubes out for 6550s and other than that the backup jcm800 is stock
balls to the wall jcm800 2203 with 6550s
According to Guitar Geek's [rig diagram](http://www.guitargeek.com/jeff-hanneman-slayer-guitar-rig-and-gear-setup-2002/), Jeff used Groove Tubes 6550 tubes in his Marshall JCM800s.
When I had my dual rec re-valved they put these in and they sound BIG
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