Tubes & logos worn as pictured. Tubes passed ALL tests. Tube codes:Δ 6D2 & Δ 7B4. TESTED STRONG AT:124/120 &118/124 with a minimum of 70 on the tester. This is very important! We strive to make this happen!
NOS NIB MILITARY SPEC RCA RED BASE 5691 6SL7 BLACK PLATE TUBES!
NOS NIB RCA 5691 SPECIAL RED BASE TUBE. PHONO GRADE & RCA CLAIMS A 10,000 HOUR LIFE! TRANSCONDUCTANCE MATCHED PER TUBE PER TRIODE.