Matched Pair RCA 6SN7GT Vintage Tubes NOS NIB 1955 Bottom Getter Hickok Tested For Sale

Matched Pair RCA 6SN7GT Vintage Vacuum TubesTrue NOS/NIB | 1955 Production | Black Ladder Plates | Copper Support Rods | Bottom GetterUp for sale is a phenomenal, matched pair of vintage RCA 6SN7GT twin-triode audio tubes in pristine New-Old-Stock (NOS) / New-In-Box (NIB) condition. Manufactured during the peak era of American tube production, these 1955 specimens feature the highly sought-after audiophile construction elements prized for their lush midrange, incredible detail, and ultra-low noise floor.Construction Details & Authenticity

• Date Code: 509 (Stamped 9th week of 1955)
• Base: Solid black Bakelite base with sharp, clean silver/white original RCA \"Meatball\" logos.
• Plates: Staggered black ladder plates. Note that both tubes feature original factory quality-control pencil tracking marks directly on the plates—a hallmark of untouched, authentic mid-century RCA manufacturing.
• Internal Support: Premium heavy copper grid posts/rods for exceptional heat dissipation and microphonic rejection.
• Getter: Clean bottom getter configuration, leaving the top glass perfectly clear.

Hickok 532 Test ResultsBoth tubes were tested on a calibrated Hickok 532 Mutual Transconductance Tester. They test exceptionally strong, performing well above the standard 2000 µmhos factory baseline. This pair exhibits tight internal triode balance and excellent cross-tube matching (roughly a 5% variance, which is well within laboratory matching standards).

• Tube 1: 2,400 µmhos / 2,400 µmhos (Perfect 0% Internal Balance — 120% of Baseline)
• Tube 2: 2,550 µmhos / 2,500 µmhos (Tight 2% Internal Balance — 127% of Baseline)
• Tester Baseline Reference: 2000 µmhos
• **Gas / Grid Emission Status:** PassedHickok Gasneedle deflection TEST.

Shipping & Handling

• Shipped in their original vintage RCA boxes.
• Tubes will be securely double-boxed and wrapped in heavy bubble wrap to ensure safe transit.
• Tracking and full shipping insurance are included.

offer with confidence. Please review the high-resolution photos carefully to verify the physical condition of the print, glass, and bases before offerding. Feel free to reach out with any questions!