General Electric GE 6DS4 Vacuum Tube Valve NOS NIB April 25 2023 They tested as follows: 56

They tested as follows: 56 and 58 where minimum (65%) is 395 and 100% is 60

It is dead quiet when the preamp is muted and has excellent frequency response and sound-staging

This new old stock-testing RCA clear top

new in box 6EM5 tube tested to spec on our Paul Hart-calibrated TV7/U

new in box matched pair of black plate GE-MANUFACTURED

General Electric GE 6DS4 Vacuum Tube Valve NOS NIB April 25 2023 They tested as follows: 56This new old stock, new in box GE 6DS4 tube tested to spec on our Paul Hart calibrated TV7 U. IN 2021 WE PURCHASED 150,000 VACUUM TUBES. IF IT'S NOT LISTED, WE PROBABLY HAVE IT. PLEASE ALSO SEE OUR 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 50 YEARS OLD. WE CANNOT GUARANTEE FOR FAILURES AFTER POWER UP AS THERE IS NO WAY TO DETERMINE