I use the Amperex PQ 1960 6922/E88CC D getter.
The best 6922 I have tried to date.
I also have Mullard 6922/E88CC that were made Mitcham Plant and SIEMENS gold pins.
both the SIEMENS and Mullard are great tubes.
The Amperex PQ D getter.They have a huge soundstage and are very balanced from top to bottom.
bass seems to go down deeper with more control,midrange is very smooth and the highs are very detailed right down to the slightest sound.
I do like the Mullard's allot the midrange is to die for very airy in sound.
But overall I think the PQ D getter are best choice? from what I have used to date.
You can always try The Amperex 6922 pinched waist tubes.
I have been told they are the best?? who knows?
I know I will never find out, they are more$ than I am going to spend.