Hi all, I built this thing about a year and a half ago. It uses 6973 tubes. It works, but it isn't blowing me away. Here are the issues I'm having: No matter what type of guitar I play through it, it sounds a little brittle as I go up the neck. If I play a single coil guitar through it, this gets noticeably worse unless the playing is very aggressive. With the Tele in particular, fingerboard noise is very noticeable. By that I mean that the usual finger squeaks and strings slapping on the frets are amplified to a ridiculous level. Sounds like a hammer on an anvil. By the way, this same guitar sounds great through any other amp it's played through. When I researched the amp before the build, I came across something that suggested that part of the amp's character was the relatively small 10W OT. I've since read that they only used those on the later 6V6 models, and that the early ones used something else. Apart from that, I'm thinking caps, but really, I don't know, and I don't want to diagnose simply by buying new parts and trying them, though this may be the only way in the end. Any suggestions greatly appreciated!