What are your go to LP's for evaluating new gear or new tubes?

Pink Floyd DSOTM.  Original first pressing, Island Records.  Bought from Muffets Music, Providence. RI. I purchased it as an import, 10 days before it made its debut in the US.

I also use the Legacy Audio Music Sampler Volume 3 CD. I picked it up st 2017RMAF.   There are many amazing tracks on it.   I know you only wanted LP’s, but felt others may want to look for this.  

I have DSOTM on Island. Island is great and will always be better than the US copies. I also have a Japanese re-master version. The Island is still the best. 

I don't mind hearing about other sources, just that streaming is not what I have. CD's have their place and some are excellent, just not what I choose for "reference", since I am so heavily geared toward vinyl. CD's provide some great bass, some great impacts, voices can sound very natural, maybe not as "airy" as we can get but tubes may be lending a hand here too? But when it comes to the nitty gritty bits, especially percussion instruments other than drums, vinyl really shines. Organ chimes, bells, all the crazy weird little sounds. Vinyl or tape, pure analog just takes them to another level. Streaming might do it, I don't know. I have no experience with it. I just know what a reasonably good system can do with a nice LOMC and the gear that can support it. Vinyl jumps to life.

Yo Yo Ma Six Evolutions

you can here his fingers tapping the fretboard. total solo performance

Edmond De Lucas Conquerors of the Ages

The highest and lowest frequencies I have ever heard on any orchestra performance. Closest to 20-20K Hz I have ever heard.

Mahavishnu Orchestra was never well recorded, nor was Bitches Brew. But since I like all that so much I do use them to test the system. But MIles's trumpet still sounds about as it should on the recording. Inner Mounting Flame, especially a few tracks, are great to evaluate the dynamics.

Oregon's bass player plays custom acoustic bass. It sounds excellent and goes low.

I have a couple Japanese repressings of the Decca The Planets, performed by Mehta and the LA Phil in 1970.  The Decca version was one of HP's "Super Disks," and I've used the Japanese audiophile pressings for many years for judging components.  This work includes high-pitched massed violins, loud brass, organ pedals, big soundstage and wide dynamics, and I enjoy listening to it; as a performance it's my favorite version of The Planets.

Another classical recording I've often used is the ASMIF 1st Brandenburg Concerto on Philips.  It's revealing how different components differentiate the unison playing of the bassoon and bass and how they handle the dissonant, held notes of the French horns.

I have a Connoisseur Society LP of Ivan Moravec playing Debussy and Ravel piano pieces that I also use--it's been praised by one of the Stereophile writers as a particularly good piano recording (I agree), and acoustic piano is an excellent instrument for evaluating audio gear.

I also use US or UK pressings of DSOTM (although I prefer my MFSL Meddle) and my first pressing of Aja.

I might also use my Classic Records reissue of the first Led Zeppelin LP or the MFSL of the 2nd, or my MCA Super Vinyl of Who's Next.