Primaluna evo 400 - unmatched tubes


Hi
quick history....i recently borrowed a primaluna evo 100 from the local store and loved it so bought the evo 300 and immediately bought 4 matched KT150's for it, but then 2 weeks later wish i bought the evo 400 ! so my local store let me return the 300 (small restocking fee) and now i have the 400. Sounds like a lot of $$ but I'm thinking this is a lifetime purchase so have justified it that way ;-)
Because I had 4 KT150s that i bought for the evo 300 i decided to buy another 4 so i could fill the 8 tube requirement of the evo 400. I'm driving magnepan .7's so more power the better. By the way the primaluna sounds great with these speakers....I've found a low end i'd never heard even when driving with 150wpc solid state and the sound is very natural, pleasant, and unfatiguing to my ears. The KT150's in my system sound much better than the EL-34's. They sound fuller and more spacious. I sat there last night and kept wanting to play just one more song....they drew me in. The choice of tubes is related to the speaker being driven so the EL-34's may sound better on a different speaker. 
Anyhow to the issue......when i installed the 8 tubes in the amp i totally forgot they were actually 2 matched quad sets so in effect i have mixed them up. Will it matter? should i have put in a matched set per channel? Will the autobias feature negate any issues?
The 2 sets were bought from different suppliers but i don't think there would be any different markings as they were both tung-sol branded. 
mid-fi-crisis
If you bought the tubes new then youre good to go. Realistically from its condition, they are not far from the benchmark reading of each other being from new. With primalunas technology, your tubes are suppose to last much longer than most of competing amps. that’s been primalunas proven history since 2001. Besides the adaptive auto bias, the tubes are dialed slightly lower on heater voltage enough to run it with the same performance as the same as the regular .55mv per tube on the KT88 family.
Post removed 
Thanks yuberist. I have so much to learn, its crazy.
I contacted the supplier of the last set of 4 tubes i bought and they said to check the manufacture date on the tubes. on the metal part says "made in russia" then the year and date. Sure enough i have 4 made in 2019-05 and 4 made in 2019-04 ........so I arranged them that way. Well i think i did......i imagine the 4 tubes to the right are the right channel? Or are they are divided by front and back row.?
MidFi....congrats on your PL integrated purchase. I run a PL Dialogue Premium and use TungSol 7581A or TungSol KT120 power tubes. Each tube set imparts a slightly different sonic picture. BTW, you know the 12AU7 driver tubes impart the most sonic influence, right?? Swapping out those two "middle" tubes will change the sound the most. For my ears the PL is something I'll keep a very long time. There is great synergy in my system with the Lumin T2 and von Schweikert loudspeakers.
I stand corrected....Thanks..

I knew someone would chime in and make sense of it all, TO ME..

I'm a little thick sometime.. actually, a lot of the time.. I'm old...

What can I say, one to many head bumps...  ;-)

Still, OLD dog new trick, do I get a treat....at LEAST!?

Regards.. 
Find some Orings at the hardware store to fit the shaft of the cage, to allow  the necessary clearance. You probably need 2-3 for the required lift.

If you do a search, there are other ways owners done it. I use the old RCA 6L6G big bottle in my PL HP, which just fits under the cage.
Thanks everyone. 
And especially for the quotes from the manual... They actually don't supply a manual with the amp. I guess I better download and print it.
.... Now work out a mod to enable to tube guard to go on over the massive kt-150s....
From the PrimaLuna EvoLution Series owners manual (page 9):   "Our PrimaLuna exclusive Adaptive Auto Bias circuit monitors and smoothly adjusts bias constantly and instantly, reducing maintenance and increasing performance due to the dramatic reduction in distortion.     The genius of this design is that the Adaptive Auto Bias™ actually improves the overall sound quality and performance of the amp.    Between 12 and 30 Watts, measured distortion levels drop by over 40%.    In addition, tubes do not have to be matched, and there are no bias (re-)adjustments needed, ever."
It doesn't matter if the tubes are matched in the Prima Luna. The adaptive bias circuit sets the idle bias current of the output tubes by sensing a voltage drop across a resistor. That voltage modulates a transistor to either increase or decrease the current to set it and then keep it at spec value. If the tubes are unmatched, or they change with age, the individual transistor for each tube adjusts accordingly. Doesn't matter how off spec the tubes are mismatched as long as they can be adjusted to maintain the design idle current.


listen to rar1/rich above

that is the right answer

How do you figure that, two sets of quads, You have no idea where their at.  At best, current matched at 10-20% per quad. NOW You want to mix the Quads too up. YES it make a difference. The reason for the match. LONGEVITY and clarity.
.
Geezzz how long you been using valves, 5 minutes. I have some in use for over 50 years... MATCHED...500 hours not matched...

Most don't mark the boxes or valves, especially bulk sellers and buyers..
SOME do. It doesn't make them a good or bad seller. Most like me have a way to current match and make sure they're BALANCED...

I don't like marks on my valves, glass or base unless it's an indexing marker.

Look at the tool marks, listen to the OLD MECHANIC.. That is what I did..
for 47 years.... I know I can, the question is, can this help you. 

IT DOESN'T MATTER.. lol  Bad mechanic.....Bad answer....Sit in the corner. Time to learn....

Your ears, your money....

Regards...
Upscale marks the measurements on the tube boxes they sell you.  Just make sure they are somewhere in the same ballpark.  Over time your tubes will no longer match as they begin to drift anyway...hence auto-bias kicks in on your amp.  I wouldn't obsess unless the measurements were wildly different which I wouldn't expect from the same brand of new release tubes.
You look real close, I bet you can figure it out.

It will have to do with distortion, more than anything. Auto bias, is usually by groups of 1,  2 or 4.  1 would be fine, but in pairs, or quads, YES it can add distortion..

Do you see why? It will average between two or 4 and adjust, between the average

Individual autobias there is no average, an lot less distortion..

BUT will have a reject point of overall tube health by some means.
A led, or something will or will not light up.

Look close, get a mag/glass their different.. TOOL marks....

Regards


Post removed 
The Primaluna has auto-bias.  It should not matter.  Go to the Upscale Audio site, it is in the FAQ section.

if you have a PrimaLuna or Mystere amplifier with Adaptive Autobias, there is no need for matched tubes, though it certainly doesn't hurt.


Rich 
Should you have put in matched quads? Yes. Does it matter? Not so much that you should worry.