Production codes are 312-013, 252. 1 tube has “Crosley” label, second tube tests very close. Tubes were in flood 5 years ago. many Nos tubes had boxes destroyed.
Pair NOS RCA JAN 6SL7GT VT-229 Tubes WWII 1944 Matched Codes B&K 707, 606 Tested
Up for sale is a pair of NOS RCA JAN 6SL7GT VT229 tubes. GM tested on B&K 707 mutual conductance tube tester where 22 is minimum = 65%. Emissions checked on a B&K Dyna Jet 606 tester. See photos provided.
MATCHED Pair NOS TUNG SOL 6SL7GT Black Glass Vintage VACUUM TUBES K.9699
Model 6SL7GT. Condition NOS. Plate Grey Round. ALL TUBE AUDIO. Tube Specifications. Tube Type Dual Triode. Variant Black Glass. Why Buy From All Tube Audio?.
(2) RCA 5691 6SL7GT Vacuum Tubes Red Bases Pair Amplitrex Tested 100% #109PC
Here we have (2) RCA 5691 Red Base Vacuum Tubes. Tested on an Amplitrex for fixed and auto bias. Listened to for quality if sound. Tubes tested 100%. Both tubes passed gas test. Please see my other listings for many more great tubes.
RCA 5691 6SL7 GT TUBE 10,000 HOUR RED BASE RUGGED HI FIDELTY AUDIO NIB
EXCL USIVE HIGH FIDELTY TUBE. Legendary Long-Life 6SL7 Variant | Ultra Low Noise | Premium Build. R C A 5691. 🔥 RCA 5691 RED BASE – INDUSTRIAL GRADE – SINGLE (1) 🔥. 💥 TOP-TIER RCA – BUILT FOR COMPUTER & INDUSTRIAL APPLICATIONS.