Time to get this site upgraded, so we are passing the hat around. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html
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And if you buy some 6GH8 tubes, look for NOS Sylvania. RCA manufactured tubes did not hold up. For that matter, toward the end, RCA bought the 6GH8 from Sylvania and rebranded it RCA because they were better.
The 6GH8 was RCA's "Milestone Tube"!
The OEM 6GH8's used in the last tube type RCA's, the RCA logo was printed in white.