Modwright PH 9.0X Tube Rolling Question

@lewm  I didn’t sub them. The PH9.0X uses one pair of 6C45 and a pair of 6922. The 6H23p is a Russian equivalent to the 6922. :)

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 also are running the Siemens E88 w/sovtek 6C45s. Just ordered a set of Mullard M8080/4058 (premium 6C4). They should be here in a few days. From what I’ve read, they should be a MAJOR upgrade to the Russian tubes. I should know by the weekend after putting a few hours on them.

Now for as changing the fuse (IDK), I'll hold off on that for now.

Blisshifi, My bad. The prior post led me to believe that the unit uses only 6922.

Thanks for the suggestions. As I started my research, Siemens, Amprex
and Telefunken get a lot of mentions. There are so many variations that
it gets a bit overwhelming. My budget is up to $500 for the pair, but
I'd like to keep it around $400.

The rest of my analog system is Luxman 505 uxii, Technics SL1200G, 
Hana SL, Harbeth SHL Plus.   

@danmar123 Where are you getting your tubes? I have purchased
from Andy at Vintage Tubes, but I don't want to wait for two months.
I will probably try Brent Jesse. Any other vendors?