I have DT880 and I like it, since most people review it has more neutral to DT990...

Thanks so much for info about it! Gibosi :)

Thanks MattTCG :) Great to know both of them! Yes, I mean the OG (orange globe)... Now I'm trying to get the Amprex then.

Thanks JayWillin for info. I'm still curious about Amprex tubes compare to Tele's tubes!...

I'd like to joint in this group :) I just bought Schiit Lyr from a member here. It is running with Telefunken ECC88 and sound is great! But since I'm newbie on headphone amp and have no clue which tubes are best for this Lyr amp! So, any advices will helpful.,, I read some they recommended...

Thanks for advices, guys! After play with Schiit lyr for couple hrs, I feel its hot but still can touch it!  Is it normal or my headphone amp has a problems!? I use Telefunken tubes...

Thanks guys for some advices... Anyway, I'm still new on headphone amp field and just bought some headphones now: -Grado SR80 -Sennheirser HDR160 And I have one set of Stax SRM 252II with SR-003 ear-speaker. My budget is around $500 for it. Again, thanks for your comments.