I got four responses within an hour or so - amazing!
I tend to like neutral sound but don't mind warmth ...
Good Soundstage is extremely important and the bottom end has to be tight ...
I will be using it for headphones so the tubes can't be noisy ...
This is not my expertise so I am really open to all your experiences ...
I buy my tubes from Andy @ Vintage Audio and he is away on vacation.
Also I think trade is much better than buying and selling in this market.
How often are people looking for single 12AU7s - I think we are all in luck

Thanks