12BZ7 ///12AX7

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

Mahlerfan, do you give your tubes time to break in??
It seems like they go in and out of your amp pretty fast.

Try some "used test strong" Telefunken 12ax7 when you get a chance. They’re solid all-rounders, and relatively common on the 2nd hand markets. But favorite 12ax7, by a good margin, has been the Mazda silver/chrome plate. Unfortunately they’re rare and expensive ($350+ a pair), and they have a bit of extra energy up top - so won’t be ideal for systems that need a push towards a relaxed top end.

Also I like those RCA tall black plates pretty well, but think the Mazdas are much better.

@lowrider57 I responded to the Q concering so called ~~Burn In Theory~~ over at my New Kids topic.
There i completely expose that scam and believe my comment is 
verifible , believebale, honest, fair, unbiased.
I put the final, last nail in 
~~The  Snakeoil Coffin* once and for all.
 @ Mulveling
Someone here on audiogon mentioned in a  post, he has tried Teles and Siemens , the Teles he found more on the ~~warm~~~ side, vs the highly detailed Siemens. 
I always go for clean/clean/details. 
I have Siemens AX's / RCA AX's /tall blacks, arriving this week. 
Look or a YT vid upload , late sunday night. 
The Mazada's , chome plates, , I recall havinga  pair, i did not like them at all.

My system now with new added silver sterling to speakerwires (16 individual wires total, = biwire 1 copper + 1 sterling 14 ga silver  = 2 X 8 = 16 insul wires,,,
and the wires are correctly employed = no criss crossing .
+ took out the E188's in the Lite LS9 Jadis clone pre and installed tyhe stock EH 12AT7's and that as well made a futher gain in details, but is more *beefier* sound, not as laid back/quiet,  as the E188's. Prefer the AT's overall. and so the AT's will remain.
My system has made some progess, and will report back on futher mods/critque.
Our goal here is to finda  path to Pure Class A resolution/highest fidelity. 
3 things , no 4 things are required
1) Patience
2) reserachreserachresearch
3) trial and error
4) $$$$$$$$

The Tele ribbed plates aren't as warm as the smooth plates - you may like those better. Surprised you didn't like the Mazdas, but systems change and optimal tube selections can change over time - are you sure they weren't the 5751 silver plates? Those were awful lol.