Modwright PH 9.0X Tube Rolling Question

@danmar123 and @audiosaurusrex This is incorrect. Electro Harmonix makes a gold pin 6C45, and the another, the best one is the Russian Reflektor 6C45. They are both better than the Sovtek, with the Reflektor much, much better. That said, they are very rare nowadays and very hard to come by. That said, there is no tube equivalent to the 6C45.

@danmar123 Yes Dan told me that there is only one version of the 6C45.

Just a heads up, the Sovtek that are in the pre are really the only option. I ordered a set of 6C4 Mullard & their to small.

I actually have a GAE w/SME 309 with the Hana ML & a 1200 MKll with the GAE arm w/AT 150 mlx & having great sound coming from both Tables. Rite now going for an extra $1300.00 to upgrade the 9.0 to the 9.0x isn’t for me, so that’s why I’ll try the Mullard roll. 😁

Yes, I agree on Fleebay. Mostly overpriced and a crap shoot.

@ericsch Most of my NOS Tubes come from Andy. I’ve had good luck with Tube depot, & just ordered the Mullards from Tube Store. this morning. Fleebay is a crap shoot.

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?

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

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.

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)

@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 own this and love it. Yes the 6C45 cannot be replaced with the 6922 to my knowledge so not sure what blisshifi is referring to. I replaced my 6922 with Siemens E188CC/7308's and the result is extreme clarity, dynamics and transparency. The instruments have more air and separation and the soundstage is rich and full. IMO tube rolling is system dependent and while I have a few different tubes to choose from I'm sticking with the Siemens for now. 

6C45 is a single section triode. How did you manage to use them as a sub for 6922, a dual triode? Not to mention that the two types are electronically quite different even if you could mount two 6C45s to replace one 6922.

I did. Was my favorite tube amp ever, but I have since gone solid state. I used both Reflektor 6C45 and Reflektor 6H23p to replace all four tubes. Huge difference althroughout. The Amperex white globes are quite incredible, too, but cost around $300/pair.