Atma-Sphere MA-1 tube rolling

6080 mil spec (same tube), should have better element support structures inside, and maybe even thicker glass, could also feel heavier. Which all should make it less microphonic and far sturdier, as for sound difference compared to 6as7g try it and see.
For memory I had them from input 13D3 > as pre drivers >to the 300b> interstage trany > 805 SET monoblocks I had, real massive hot beast of amps

Cheers George

What George above said and / or try asking Ralph at Atmasphere himself. He writes here from time to time.

I know that old stock 6AS7Gs dont typically work as well in place of the newer types that Ralph sells. The same may be true of 6080s. 

My advice would be to concentrate on the 6SN7s and to leave the power tubes alone at least for now. Not all sections are equal in terms of sonic impact and it may be that you need a pair of GTA or GTB in one section with GTs/5692s being acceptable elsewhere.  Call Ralph and he will clear this up. 

I have retubed Atma-spheres before and my clients have reported positive results using old stock 6SN7s. I have never replaced any power tubes. Mixing 6SN7 pairs with different strengths seems to yield positive results.