Hi: Fact is, I have NOT yet played with the T/P switch. I started, when the amp first arrived, on Triode. I loved it, and stayed there for many hours over the following days. I finally did try Pentode, but only for about half an hour or so. Don't know if it was just preconception at work, but it seemed to get louder (compared to same gain setting on Triode) and a lot less sweet, less detailed.
I will, in the near future, give Pentode operation more of a chance. Note: You can't "shift on the fly", which would make comparrison listening a breeze. To switch modes, you have to power down. Wait for cool off. Power back up (and wait for warm up). It's still not a big deal, I know. But it's not the t/p/t ability that a lot of posters on other sites seem to think it is.
And yes, while I prefer analog in my rig I do have a digital camera. One of these days I'll even figure out how to post pics on the web (if you've got a photo-hosting for dummies pointer or two, I'd be glad to try).