Well my favourite is the Tung-Sol as it has the best balance for my ears. Mullards are very good too. The ones I like are the military version CV2984. They have an equally capacious sound stage, a bit cooler and cleaner than the T-S, occasionally a bit too much so for certain music, for other tracks it's great. I did try the non-military ones, just the plain Mullard 6080, but they were very microphonic and couldn't properly assess their sound. Maybe someone else could advise on these.
I've also used Raytheon, very fast and clear but occasionally a little too much at the top, Bear in mind I'm using K702 and HD600 cans. They will sound warmer with some other headphones.
Others I've used are Philips and GE which are both very good all rounders.
One I could not recommend is Thomson, which for me was too thin and shrill.
I think 6080 is a tube type well worth exploring as a power tube in Elise. I find them generally sweet, clean and clear rather than lush and they have a big sound stage. - oh and I've had no hum issues with any of them either.