I have no experience with the Meier Classic so can't comment on it's performance with the HE500's compared to the Lyr. Although if the tubes in the Lyr are Orange Globes, then the Lyr is capable of more. Then again, if you're happy with the Meier Classic, maybe it's not worth the extra $ for more Lyr tubes. Could be the Meier outperforms the Lyr even with holy grail tubes, which the OG's are not. Sorry-this isn't the right thread for this.
Well, you are talking about driving the HE-500s, so why not. I was enjoying my 1967 OGs with the HE-500s recently. I wouldn't dismiss them, esp. for the price (pretty sure I paid $70). I went from those to some 1974 Voskhod Rockets, which aren't as musical. 1961 Bugle Boy Straight Man + HE-500s + live Rush has me rockin' atm, though
What are your holy grail tubes for the Lyr + HE-500s, at least from what you've got on hand?