RCA 21LU8 Vacuum Tube Valve NOS NIB Matched Pair 6AU6 likely Tung-Sol-MANUFACTURED) measured 31 while

likely Tung-Sol-MANUFACTURED) measured 31 while Tube Two (no silkscreening 6AK5-LABELED

and dynamics even though these amplifiers use 6J5s

Two are RCA 956s and the third is a Tung-Sol JAN-CTL-956 / VT-238

They measured 62 and 76 where minimum (65%) is 46 and 100% is 71

It also sounded great in my Schiit Audio Vali 2 headphone amplifier

RCA 21LU8 Vacuum Tube Valve NOS NIB Matched Pair 6AU6 likely Tung-Sol-MANUFACTURED) measured 31 whileThis new old stock, new in box RCA 21LU8 tube tested to spec on our Paul Hart calibrated TV7 U. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY QUESTIONS. 1. MOST OF THE TUBES WE SELL ARE OVER 70 YEARS OLD. WE CANNOT GUARANTEE FOR FAILURES AFTER POWER UP AS THERE IS NO WAY TO DETERMINE