Groove Tubes GT12AX7M Mullard

[Systematic Chaos]

Anyone remember these?
They were hyped some 10-12 years ago and IIRC Harley was a massive user and was raving about them.
I always thought they were discontinued....
I went to a music store today and they had a massive stock so I bought 2 (18$ a piece, fairly reasonable) for my also newly acquired Mesa V-Twin.
First impression is really good....detailed and musically rich

[rnolan]

He SC, no I don't recall them, but Harley (where is he these days  ) know his stuff  So what are they really ?  GT don't make tubes (as you know) just test and rebrand.Shame you don't have an ADA preamp with you to test them in  .  My guess is these (from what you say) would be nice in a MP1.

[MarshallJMP]

They were supposed to be a reissue mullard back in 2000, they still sell them but now they are just rebranded Chinese tubes.

[Chip Roberts]

I have GT12AX7s in both of my MP1s.  What makes this particular pair different?