Just getting this out again. Any advice would be appreciated.
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Rolling the 6DJ8 family tubes with NOS will pay genuine dividends. What I heard from my unit was consistent with the character of the particular tubes I used. IOW the tube will sound in the PH-7 pretty much the way it sounds elsewhere - the PH-7 is pretty straightforward in that way. Amperex 6DJ8 Orange Globes, Amperex 7308 USN, Valvo 7308s, Siemens 7308, Telefunken 7308 - they all worked well. In general I heard smoother, sweeter and higher top end extension with more air and articulation. Overall better tonality and image specificity. Bass tightened up a little bit. A nice phonostage got nicer! Fwiw, I used the Herbies Tube Dampers over the stock silicon rings.