Tube Rolling Time


I want to dive deeper into tube rolling.  I currently have a Decware Zen and Luxman Neo Classico SQ-150.

What should I consider next?  Conrad Johnson is on my radar.  Suggestions?
allane
@oldhvymec

I just want to listen and play with tubes, more.  It’s something I’ve always wanted to learn more about.

Thanks to all of you for your recommendations and suggestions.  I’m learning a lot.
I just want to listen and play with tubes, more.  It’s something I’ve always wanted to learn more about. 

Sometimes it's the music, sometimes it's the gear, sometimes it's both.
It is interesting, is it not? Some people settle for what sounds good, some won't stop till GREAT.  AND there are those, that CAN'T stop, no matter what, good better or BEST, just can't stop... LOL it is a great hobby.. Get a tester, don't spend a fortune, and enjoy all the little tricks of testing, tuning, tinkering, BLOWING UP!! Don't do that test.. LOL

You'll be amazed at what some people called matched, and NOS, you'll really get a lesson in ethics, if nothing else.. LOL

Regards
Suggest you start your rolling journey with the input tubes (small signal tubes). The input gain stage has the most influence on sonics. Next, the driver aka phase inverter tubes, have some influence on the sound. 
Rolling the rectifier tube can have a very audible effect on the sonic signature of the amp.

I'm a believer in using NOS tubes from a reputable dealer.
+1 on Brent Jessee website. There is a wealth of information on the sound produced by tube type and by  each manufacturer.