tube upgrade for first sound

Artg are you referring to Amperex 6922 Pinch Waists? I've been using Amperex 6922 PQ White Label USA...but halo getter...not Pinch Waists. I love these tubes in the First Sound. If the Pinch Waists are 200% better ('cuz that's how much more they cost), then I'm eager to hear some.

tvad - mine are same as yours. PQ white lettering, nt pinched waist. I'd like to also get some pinch waists, but have yet to see any for sale.....

To calrify again - my PQ 6922's are the "D getter" version - early 1960's production.

ok - so two more simple tweak considerations for First Sound owners. Maybe this has been covered already, but it bears repeating, i think...

1) Aurios isolation/decoupling bearings - clean up and solidify the sound very nicely. Emmanuel recommended them, and as usual, he is right on the money....

2) straight into the wall. I found my Hydra robbed a bit of the inner sparkle and life.

Hello Guys

Please excuse my ignorance, but where can the above mentioned tubes be purchased? What would I ask for? I'm just getting into tubes so this is a whole new world for me. :-)

Thanks

Paul