Modwright PH 9.0X Tube Rolling Question

I have the 9.0x. I’ve tried every current production and NOS tube under the sun, except Telefunken. Here are my favorites in order of preference ( some with Herbies Rx tube rings and some not. You must experiment for your rig. System audio is professionally calibrated. All tubes listed excel in tonality! 

Valvo 6922 1960-64 ( same as Philips miniwatt Holland) and PCC88 (7DJ8) A frame or non A frame . ( These tubes fire on all cylinders across every genre of music I throw at them. Superb. You can save money by getting the PCC88 versions. They are safe to use per Modwright and will likely last a long time due to their 7v heaters only receiving 6.3v from the 9.0x. Very very close sound to the E88 cc versions.

Matsushita/Mitsubishi 7DJ8 tubes. I believe these were made in the 70s or 80s.

(very musical. If Valvos are a 5th row seat, these are a 10th row seat. I like both approaches)

Siemens E88cc (a nice all arounder tube)

Bel India 6922 1960s (made with Philips tooling. Very musical, engaging and balanced)

Amperex 7308 JAN USA 1960s ( deepest tightest bass, but others listed above are also excellent for bass)

Amperex 7308 Holland ( small-ish soundstage compared to those above)

Mullard E88cc ( too warm. No sparkle, but a good choice for a bright system)

I had Dan update my PH9.0 to a 9.0XT. In my pro calibrated audio system (modest)

and using a Pro-ject Xtension10 turntable with a Soundsmith Paua ES cartridge, I found that without question and  in my system that for 6922/e88cc  tubes, Valvo and Philips SQ miniwatt (same tubes from Heerlen plant in Holland 1960s) sound the absolute best and even better with Herbies Rx rings toward top of tube. There sound is about identical with maybe a very small dose of additional extension with the Philips SQ tubes. These are audibly very well balanced tubes with most holography, projection, texture and tone. Only Siemens tubes came close. Other tubes didn’t quite cut it and had too many shortcomings. They were Amperex Holland (7308 with surprisingly small soundstage) , Amperex JAN USA Cryo tubes ( 7308 soundstage weirdly very tall and sound a bit off) , nos Bel India E88cc ( not bad actually) nos Mullards ( not extended enough but good tone) current production Gold Lions (meh), Valvo PCC88 7v nos tubes ( similar sound to Valvo and Philips E88cc but a bit brighter and less full sounding, but still good tubes for this phono pre)  and nos Philips JAN green label E88cc tubes ( dull). Alll tubes were measured near nos or better when purchased.

My tube of choice for the PS is Raytheon (Japanese made 1970) 5AR4 tube. It has the smallest voltage drop and sounded the most correct vs an RCA 5r4  big bottle (way too warm) and an NOS 5ar4 Mullard that everyone raves about. The Mullard sound signature was somewhere between the rca and Raytheon but wasn’t quite extended enough. I was reaching for highs that weren’t quite there. The Raytheon was closest to solid state but with just the right amount of tube goodness. The stock Sovtek tube is a good ( slight grain)  starting point but doesn’t quite deliver like the Raytheon. I could live with it and  I’d still choose it over the Rca or Mullard. I suppose the Mullard would be good in an excessively bright system. The NOS RCA is simply too warm. A Herbies Rx ring for the Raytheon took it up another notch when placed toward top of tube for better focus. This is my conclusion after much experimenting with a variety of nos tubes.