Recently? No... When New Sensor released their ElectroHarmonix branded 6V6's, around 20 years ago, they were touted as being dead nuts copies of the venerable RCA's. Well, they didn't exactly impress me as equivalent to RCA, though they did their best to make the tubes appear that way. But, they weren't awful so I carried them. For a while. Came a time I noticed a lot of early breakdowns, and about that time JJ got their pin diameter problem sorted out, and JJ 6V6 became my stocked item. Also, around the same time, New Sensor released their "TungSol" brand. Examining TS vs EH, they appeared identical, except that the plate rides a little higher in the TS variety, closer to the top of the bulb. Didn't do any interior exams though. So, if there are any actual build differences, I am unaware of them. I took New Sensor's game to be, "we'll put a prestige label on some of the tubes we're making, pretend they're better somehow, because they bear the name of a trusted USA manufacturer, and charge a higher price." Can't say I've been positively impressed by any of the tubes from Russia bearing the TS logo, including the 6V6. But then again, I might be biased (?!?) because they generally arrive in amps needing repair. One time a customer brought in a freshly bought quad of TS EL34's for his reissue Marshall Lead 100. Naturally, one was bad right out of the box. So he swapped 'em for EH's. Same story! Harrumph! And phooey besides! I installed a set of JJ and away he went, serenading his neighbors at top volume from then on. That's my story & I'm stickin' to it.
Same goes for so called "reissue" Mullards.
I'd say you had a lucky streak with Russian T-S labeled 6V6's. Party's over! Let's hope JJ keeps their quality control up. Because everything made in China just went up 25%, good bad and indifferent.