They are 6922's in the PH3, and I use 3 Siemens 7308 gold pins that I bought from Upscale Audio. They sound great! There are millions of other possibilities as well, including Mullards, Telefunkens, and Amperexes.
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I have used 2 Amperex 7308's on the 1st stage, and 1 Amperex 6DJ8 Bugle boy. A bit noisey, but very musical. Upscale will not sell 6922 tubes unless you bought from them equipment.
I have also used the 6H23n in place of Sovtek in the BAT5 preamp, but the last and most critical tubes, I still use Amperex 7308, at least that saves a lot of money (8 tubes in BAT5).