Phono preamp tube rolling.

Tom, What is “pyseabo”? Is it another word for “placebo”? Or did autocorrect do damage to your intentions?

to the OP: I try to use high quality tubes. Once or twice I’ve paid extra to RAM or Kevin for matched or low noise tubes. However tubes age at different rates, so what are matched or low noise tubes today might not be so in a month or 6 months. Still it’s hard to argue not to start with low noise for the input and any other gain tubes in a phono stage. Beware that boutique or NOS vintage tubes sold these days are very likely to be fakes. I have some Telefunken and Amperex tubes that I bought in the late 70s; I believe they’re real but I have no gear that requires a 12AX7 or AU7. I don’t “roll” tubes with any expectation that SQ will improve because of the brand or provenance. I replace tubes that I suspect are near the end of their lifespan.I own a good tube tester, but the real way to test a tube is to measure how it is functioning in the equipment. To do that you need a knowledge of electronics and how to read a schematic.

@lewm 

NOS vintage tubes sold these days are very likely to be fakes

Fakes, you mean like really fakes, made faked under popular brands and models or just low quality NOS described as something very special?
Yes, testers gives you basic useful info, but of course not guaranteed that equipment won’t change tube function right after a tube being installed. Common vacuum leak could happen too specially during vintage NOS installation. 

Yes, tubes age at different rates. It is however my experience that tubes that start off low noise continue to have relatively low noise over their life span. I undoubtedly change tubes prematurely. I change my oil prematurely also. Makes me feel better.

surfmuz, What I meant is that there are nefarious persons who change the markings on tubes that otherwise look very much alike, so as to make inexpensive versions look just like rare and more valuable NOS tubes.  So, before shelling out big bucks for a Telefunken or Amperex or etc, it is wise to equip yourself with the expertise necessary to tell them apart regardless of the labeling on the tube.  On the other hand, I would totally trust Upscale Audio, Jim McShane, RAM, and certainly others with whom I am not directly familiar.  I would NOT buy expensive tubes off eBay.  Also, there are current manufacture tubes that do sound excellent and are reliable, made by JJ  and Sovtek, for two examples.  There you have good quality at reasonable cost.  In my experience also, some of the Chinese made tubes sound great but have a shorter than average lifespan, way too short.

Tube Rolling is a great experience.
Learning how certain Brands and Production Era's interface in a circuit and deliver into the Downstream of the System is a something that is worthwhile undertaking.

Trusting the Supplied Tubes is the issue.
I have come to terms with the fact that Tubes will make music happen, and to the inexperienced such as myself, I would not know whether one is of the ideal measurement.
An asking price from a Vendor can suggest it is Factory Spec and certain supplied measurements will suggest the Tube is Factory Spec.
Give such a Tube to a Time Served Valve Individual with Testing Kit  and a full knowledge of testing and the supplied Tube can be proven to fall short of the Factory Spec by quite a margin.

I only purchase Tubes today that come with the right to return if a secondary measuring  at my end does not match the vendors advertisement.

I have returned Tubes for the above reason, both  NOS and New.   

As a result of being vigilant with a purchase, I have Vintage Tubes in a DAC, Phon, and Power Amp.
I have selected these over New Tubes as a result of Tube Rolling experiences.