Since today, we are happy to feature a new article that explains the fix for the AC30HW tube issue. Thanks to Donpaul McAllister for providing this article and his effort in revealing this issue, gathering information and finally getting Vox to fix it for new production series. Also thanks to all other helpful people at the Gear Page and Vox forums.
Go here for the article. Also see the official Tube Issue Statement by Vox below