12BZ7 ///12AX7

Those spec sheets on the 
BH/BZ/AX, all look similiar.
But note:
I am never using the vol on the preamp with much gain, My room is 10X12/8 ft ceiling, why crank it up??
= No reason at all.
The Jadis's trans , inspite of RUMORS of a  *previous model* (a  rumor I ain;'t buying). , the Jadis builds like tanks, indestructible. 
If the BZ, BZ has over heating issues, the tube will blow before anything inisde the Jadis./

Besides there are resistors inside the Jadis, either the  resist or tube will blow,,,
I will carefully note the BZ/BH's temp, while employed.

Also I made some changes in my speaker wiring, Added silver to the copper.
Thing is, as i was making that mod,,i noted one biwire was crossed wrong. I had one neg going to the opposite post, That is the left channel had 
the black lines crisscrossed, and THIS was no doubt causing HAVOC/HIGH DISTORTION in that cahnnel and completely annihiliating /destroying, mulitiating the fq resolution. 
.
So correcting that ~~unforgivable~~ error  
OKUS adding the silver sterling 92% silver line with fat copper strand.
= the resolution of fq's in super.
This Jadis sings now.
When I put more vol on the Lite LS9  Jadis clone, there is no ~~complete breakdown~~~ of fq's = the high level of distortion (which i attributed to the pre's low level of build quality) has all disappeared.
Perhaps the added silver did nothing at all to gain high fq resolution..= IOW was the whole issue the crisscrossed speaker wires??
Or did thev added silver add a  clean, clear, nice gain in resolution???
I have no idea and will not make any experiements with 
all copper vs 
silver/copper.
Time constraints.
The Bz/s'Bh's , will arrive late this week, will report back on how that tube roll went off. 
Let me finsih by saying the sound is completely 
~Non Fatiguing~ = Zero fatigue Factor~~ (aka ZFF)
I loistened to Mahavishnu Orchestra, Live Central park, and wasblown away at what serenity overcame me , which never on previous systems experienced.
That record is not high fidelity studio, Diana Krall was mesmerizing. 
I could retire from this mod adventure with what i am getting from the system. 
But as a  seeker of high fidelity, this desire to make futher discoveries is calling me onwards.
I have 20 M SGO caps to be employed in my cayin cd 17 Mark1.
later this year will rebuild the Thors xovers with M high level caps. 
Along with the cayin SC6.
The SC6 employs 4 AU's,,well you already know what i plan to do, and will ck the E80CC's tempt while in play, and also the heat level on tops of trans. 
Cayin is like Jdais, build quality impeccable, ~~build like tanks~
YT vid update comming  Sunday. will post a  link.
But as a  DIY member noted, a  YT vid offers little in forminga  opinion on a stereo sound.
I agree in part only.
After listening to countless YT uploads of stereo's in performance, I can now  hear through the compressed replay.

Here is a  example froma  YT vid with a  guy showing off the M high level caps mod in his amp. 
I can hear the M caps singing GORGEOUS.

Not the vid I was looking for , yet another testimony to M caps singing ~~Like Angels~~~

https://www.youtube.com/watch?v=3vLTeIDuWmM


Here is the reference vid i was looking for.
https://www.youtube.com/watch?v=XfqWgHqiPwQ

Now listen to this Class D/Class F sound with Jadis; audition room at a  stereo show

This is not the vid I was looking for, but it will work, showing how a  speaker can drag down a  complete $100K Jadis set up, to ~~Class F ~~ sound.

https://www.youtube.com/watch?v=CIut7iVo7DM&t=291s


and note carefully in this vid, where you can see one of the best mid/tweets ever made.
The Seas Millenium!!!, UNREAL, either the xover design/parts or that mid range is driving the entire Jadis + Millenium down to grade
Class F. 
No I can not grant a  ~~Grade D~~ to this horrific atrocious sound level. 
This is from a  Munich 2019 show

https://www.youtube.com/watch?v=Hzbz4b09bH8

So agisnt the opinion of the DIY member, a  stereo 's quality of resolution can be noted, at least on most vids. If you have a  
1) trained ear/sensibility 
2) practice makes perfect
3) listening attentively
4)  replay as often as needed to draw some conclusions.
Every Jadis showroom upload on YT, , has these horrific speaker set ups, dragging, what otherwise could be a  Pure Class A sound down to
~~Pure Class D~~ And in this Munich show, down to  pure class F Minus resolution of fq's. 

The BH/BZ/AX data sheets all look similar in the same way that a bicycle is similar to a motorbike. They have the same number of wheels and you need to balance to ride them.
Well if nothing else you’re enthusiastic about it all! But don’t be disappointed if it doesn’t work out. Do yourself a favour and have a tech check the operation.
Gain in the tube also sets the circuit dc voltages, not just the volume control position. If you look at the data sheets you’ll notice the amplification factor and current ratings are totally different for each tube, reflecting the different control grid construction and size of each.

BZ7’s arrived, = No go, 12AX7’s out shot the BZ’s in every area.
Now i am on witness a shoot out twix several AX’s
RCA Tall Black Plates vs
 Philips Miniwatt vs
Shugaung T series vs
Siemens  ,
~~~USA vs
Gerjmany vs
Holland vs
China~~~~~
One of these 4 finalists will be given a ~~~Gold Medal~~Silver Medal~~Bronze Medal~~Copper Medal.
,i have no idea howm this Olympic battle will go down.
All 4 are Legenday and may result in all receiving Gold = Miniscule dif.
also want to try Baldwin Organ AX’s. which i am guessing is a RCA.
IMHO Philips is Amperex SQ , made in the legendary Herleen plant,
Phlips Mini watts = Amperex Bugle Boys.
what it comes down to is this
All NOS (rated at least strong) are near equalin voicing. The more important concern are what caps are employed in the amps design.
Tech guys with testing equipment lay claim that if low price cap A tests near equal to high price cap B, then sonaiclly both with sound very sililiar ina amp.
Yet my concern is the limitations imposed by measurable equipment.
IOW I believe there may be more to a cap’s voicing of music, that can not be meausredn ~~~~completely with NUANCES~~~ by a test screen.
Its kinda of likea botanist studing flowers. A text book along with disections/images, still misses the flower in its own enviornment in full bloom.
someone over at DIY mentioned it is near impossible to determine the sound quality of a unit, based ona compressed YT vid witha low level mic/camcorder.
True and yet not so true.
I have skill at listening to what a unit sunds like in real time. If you can not hear the high fidelity of these M caps, you need a hearing aid.
The M caps glorious sing the muisc.

https://www.youtube.com/watch?v=XfqWgHqiPwQ