Both my Victory Sheriff 44 and my Seymour Convertible 100 have wonderful Mullard 161’s from 60’s Blackburn, and are adjustable-bias with very nice original St.Petersburg Svetlana winged-C’s.
Both amps are soaked down by Palmers, and a blended (filtered/un-filtered) signal from each high-gain amp feeds a modest stereo mixer/fx-rack, before hitting a modified Peavey Classic 50/50 valve power amp - with Mullards.
Like you, I'm a fan of NOS tubes, though I haven't decided yet what to install in the Mark VII; I generally like to live with an amp using its original tubes for 6 months or so to get a handle on what I want to do with it before installing the tubes. I have an RCA 7025 I've been saving that might go in v1, and a couple of NOS GE 12AX7s; I'll need a couple more NOS 12AX7 tubes to complete the installation. I'm actually pretty happy with the JJ 6L6s that are in the output section of the amp as it came from the factory, in fact, the amp sounds really good with the stock preamp tubes, so I guess there's no rush.
My PRS HXDA amp is a clone of Duane Allman's 'Live at the Fillmore' Marshall Superbass (the Allman Brothers got the original amp for PRS when they were still touring; they were PRS amp endorsers). So I installed NOS Mullard 12AX7s, and when one of the factory-installed Winged-Cs blew after a year or so, I replaced them with with NOS Siemens EL34s that sounded a little leaner, and more like Blackburn Mullards to me; this was Doug Sewell's suggestion when I met him, he designed the amp and his advice was most welcome!
I have a PRS DG30 that was a special 'first 20' run, and came with NOS Brimar 12 AX7s, and NOS Russian EL 84Ms, a high current version of the EL84. It has an NOS Mullard 12AT7 for the reverb return, but a JJ12AX7S for the phase inverter. In that amp, I found the JJ sounds best in that position.
The Mesa Fillmore 50 has NOS GE 12AX7s, and Telefunken 6L6s that aren't NOS but sound fantastic. Telefunken USA makes high end microphones, tube and solid state, and for some reason they also offer hand-selected output tubes JJ supplies them with, that they have cryogenically treated. Cryogenic treatment sounds like BS, but it was developed at a nearby university for heavy industry to stiffen metals. The nice thing about the cryo tubes is that the metal parts inside the glass don't vibrate nearly as much, so they tend to eliminate tube rattle in combo amps like my Lone Star (the rest of my amps are heads). Right now I have the Siemens EL34s in that amp, but being NOS, they don't rattle, either.
I have a quartet of NOS Siemens EL34s in the Lone Star 100, 4 NOS GEs, and a NOS Siemens E83CC in v5.
I mention this simply because I like talking about tubes, not because I think I'm all that.
The icing on the cake was to go with Alnico speakers.
Two 1x12 Montage cabs with 8ohm Alnico Creams - I collected the drivers off the production line whilst the glue was still warm!
The great thing about the Cream was that it still sounds good at 1W, and was designed to be linear. So you can dial-in sounds at home comparatively quietly, and they will relate when you ask them to faithfully reproduce at gigging volumes.
Awesome that you were able to pick them up like that!
So far I love these speakers. Mine still need a little break-in but I couldn't be happier with a speaker. In fact, it's exactly as you say, the speaker is very linear.
I know people love the 65W Creamback, and I do have one in a Victory 10W combo.
But running that combo’s amp into one of my Cream 1x12’s - it’s simply up another level in terms of maturity, warmth, and linearity.
I haven't used the ceramic Creamback 12" inch speakers, but I have four of the 10" Creambacks in a Mesa 4x10 cab, and at least in that application, it's a nice sounding speaker.