RCA 21LU8 Vacuum Tube Valve NOS NIB Matched Pair 6AU6 It also sounded great in

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

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

new in box RCA 6AD7G tube tested to spec on our Paul Hart-calibrated TV7/U

rectangular mica spacers (with rounded edges on top)

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

RCA 21LU8 Vacuum Tube Valve NOS NIB Matched Pair 6AU6 It also sounded great inThis 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