After spending a couple days with the Gold Lion started noticing soundstage was more focused in the center. Put RCA’s in and soundstage went beyond speaker boundaries and that’s no warm up, maybe I posted to soon. I still like them but better than RCA’s maybe not. Will compare to other tubes. I might have been wrong on this one.
Welcome to the most consistent quality of tubes: the here today, gone tomorrow sense of bliss (or merely contentment).
There's definitely a durable difference in sound quality between vintages & makes, but it will at times seem exaggerated (often on first listen to a new make), and at other times subdued.
Good vintage tubes are consistently better at rendering spatial information than new stock. But new has its advantages - they offer a good palette of tonal balances to choose from, and (crucially) it's easy to select for low noise at reasonable prices. Some of the new small tubes (12AX7, 12AU7, 6SN7) measure extremely strong for transconductance, more than any vintage tubes you'll find. This can be an advantage in certain slots. Russian Tung-Sol 6SN7GTB sound a lot more dynamic than any vintage 6SN7 in the V2 (driver) slots of my VAC KT88 amps. In V1, old 6SN7 rube, but in V2 the new ones can't be beat.