Stock work well in mine, but I'm using Genalex Gold Lion KT88's and haven't had any problems. Always keep a spare matching set of tubes for back up. If one of your outside tubes went # 1-7 or # 2-8 you may have a cold solder joint out. People don't give this amp the credit it's due. It's a great amp especially hooked to the SLP98P. If you go with KT120's call Cary to ask what to bias them at. Good luck.
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