I got my Little Dot MK III about a week ago and yesterday a pair of Mullard M8100s arrived which I'd pre-ordered in anticipation. They came a bit faster than expected! Anyway, I had to try them out, just to see if they were working...
It's too early to say as the original tubes are still burning-in, the Mullards are still burning-in, and so are my headphones (arrived just after the Little Dot), but I would tentatively agree with Dept_of_Alchemy's first post regarding the Mullards. I'm very much enjoying the bass, but I'm going to try and find something with a bit more detail (though I expect the burn-in will take care of that, anyway). I've got a couple of Voskhod 6ZH1P-EVs on the way which I'm going to try next.
I'm keeping it simple ATM - just trying drop-in replacements so I haven't had to fiddle with any jumpers yet. Does anyone think it is worth me doing any power tube rolling (with recommendatons, if so) or should I just stick with the drivers for now? Actually, I should probably get at least one set of drivers burnt-in first...
It's going to be interesting re-trying the tubes once they are all burnt-in...
So, thank you all for the advice in this thread. I was very pleasantly surprised how easy the first tube rolling steps are.
And an extra thank you to TrollDragon for pointing me at the DIY headphone stands thread. I should have said something earlier but I'd already derailed the thread enough by that point!
And finally, apologies in advance if I ever write valve - I'm English and I can just about remember valve driven computers...so I can't help it.