🏭 Manufactured by Sylvania in Emporium, Pennsylvania during the 12th week March of 1968. ✨ Sylvania factory boxes are included. PERFECT MATCHED SET. 📅 42 = internal lot, tooling, shift, or inspector designation.
Item Tag: Valve
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ZENITH 6SN7 GTB TUBE RED CROWN PREMIUM AUDIO CHROMED HALOS MATCHED QUAD (4) FOUR
If RCA was Chevrolet, Zenith was Cadillac. ✅ Heavy-Duty GTB Construction. 🔥 NOS Zenith 6SN7GTB Matched Quad – Original Zenith Boxes – Premium USA Audio Tubes 🔥. ✅ Genuine USA-Made Zenith 6SN7GTB. ✅ Original Zenith Radionic Tube Boxes.
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RCA 6SN7 GTB TUBE 1968 GLOW TOPS 2 HOLE TOUGH DOGs TALL BOTTLE MATCHING SET NIB
🔥 RCA 6SN7GTB – NOS/NIB – 1968 Date Code BX – Genuine RCA Radiotron 6SN7GTB matched pair 🔥. TOUGH DOGS. 📅 Date Code BX = September 1968 RCA production. TALL BOTTLE. PERFECT MATCHED SET. ✨ Tall bottle construction.
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SYLVANIA 6SN7 GTB TUBE 1951 CHROME TOPPED HALO BLACK PLATES MATCHING SET
✔ Custom 6SN7 platforms. 🔥 Genuine U.S.A. Sylvania manufacture. MATCHED SET. BLACK V PLATES. Production Year: 1951. EXCL USIVE HIGH FIDELTY TUBE. 🔥 Matching pair. 🔥 Black plate construction.
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RCA SELECTRON 6SN7 GTB TUBE 1957 TALL BOYS CHROME TOPPED HALO MATCHING SET NIB
Production Year: October 1957. PERFECTLY MATCHED SET. Matched Codes: AE 743. I mark every tube in order to avoid tube rolling! ULTRA RARE HI FIDELITY VALVE. 2 HOLE BLACK LADDERS. Tall Black Base. BEST TUBES ON THE MARKET. NO LEAKS. NO SHORTS.
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SYLVANIA 6SN7 GTB 1968 GREEN LABEL BLACK BASE CHROME TOPPED FOIL MATCHED SET NIB
🏭 Manufactured by Sylvania in Emporium, Pennsylvania during the 12th week March of 1968. ✨ Sylvania factory boxes are included. PERFECT MATCHED SET. 📅 42 = internal lot, tooling, shift, or inspector designation.
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SYLVANIA 6SN7 GTB TUBE 1965 GREEN LABEL BLACK BASE CHROME TOP FOIL MATCHED SET
✨ Sylvania factory boxes are included. PERFECT MATCHED SET. Mutual Conductance: The 750 is a dynamic mutual conductance tester. This is a more sophisticated test than a basic emission only test, which only checks the cathode’s ability to emit electrons (super heated).
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SYLVANIA 6SN7 GTB TUBE 1968 GREEN LABEL BLACK BASE CHROME TOP FOIL MATCHED SET
🏭 Manufactured by Sylvania in Emporium, Pennsylvania during the 12th week March of 1968. ✨ Sylvania factory boxes are included. PERFECT MATCHED SET. 📅 42 = internal lot, tooling, shift, or inspector designation.
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SYLVANIA 6SN7 GTB TUBE 1959 CHROME TOPPED HALO BLACK PLATES MATCHING SET
✔ Custom 6SN7 platforms. 🔥 Genuine U.S.A. Sylvania manufacture (EIA 312). 🔥 Date coded 312-939 (39th week of 1959). MATCHED SET. BLACK V PLATES. 🔥 Matched pair. EXCL USIVE HIGH FIDELTY TUBE. Production Year: Emporium, PA – September 1959.
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SYLVANIA 6SN7 GTB TUBE 1959 CHROME TOPPED HALO BLACK PLATES MATCHING SET
✔ Custom 6SN7 platforms. 🔥 Genuine U.S.A. Sylvania manufacture (EIA 312). 🔥 Date coded 312-939 (39th week of 1959). MATCHED SET. BLACK V PLATES. 🔥 Matched pair. EXCL USIVE HIGH FIDELTY TUBE. Production Year: Emporium, PA – September 1959.