I must respectfully disagree. I have the EE Minimax and LOVE it. So far I have tried the stock tubes, JJ Tesla, and I have Amperex orange globes on the way. The JJs sound completely different in the Minimax than the stock. Much warmer and more analog like without question. Not a bad tube at all for the money. So I have found the Minimax to be sensitive to tube rolling so far.. and am loving the experience.