I think the tubes in my used Carr 2006 Mercury might need replacing. I have an EJ strat and use Vovox 10 foot cable, going straight into the amp. Both are known for great clarity and brightness, yet it sounds a bit muddy and the bass lacks definition. So I thought maybe a valve replacement might work. It currently runs on an EL34, but according to the guys at Carr, the 6L6 will improve clean sounds. So, I am wondering, who makes the best 6L6 (RCA Black Plate) today? Best reliability, low microphonics and noise etc? Or should I just get a NOS 6L6 RCA Black Plate somewhere? Where should I go for that then? well thanks!