SYLVANIA 6SN7 GT TUBE 1951 BAD BOYS CHROMED FOIL VT-231 CLASS MATCHED SET

SYLVANIA 6SN7GT

*BOGEYS*

BAD BOYS

*CHROMED FOIL*

BOXED PLATES

MICA TOP (No v Cutout)

MATCHED SET

EXTREMELY RARE - NIB (Original Factory Boxes)

EXCLUSIVE HIGH FIDELTY TUBE

🔥 SYLVANIA 6SN7GT – 1951 CHROMED FOIL BAD BOYS – MATCHED NOS PAIR (2) 🔥

🔥 1951 production – premium domestic Sylvania build 🔥 Date code 139 – matched production 🔥 Tall bottle / chrome dome getters – classic high-end construction 🔥 Black base – stable, low-noise platform 🔥 True “VT-231 style” performance without military stamp 🔥 Strong, balanced emission – matched pair behavior 🔥 NOS condition – exceptionally clean glass and internals 🔥 Audiophile-grade – high fidelity, low microphonics 🔥Original Factory boxes - protection and period correct appeal

These are late 1940s Sylvania 6SN7GTs—domestic counterparts to the VT-231, built with the same performance-first mindset before later production softened.

Tall bottle, chrome dome construction delivers:

• Tight, controlled bass
• Open, articulate midrange
• Smooth, extended highs

Fast, stable, and highly musical—ideal for preamp and driver stages where clarity and balance matter.

Clean chrome tops, strong emission, solid bases, and excellent pins. Proper NOS examples with matching performance.

💥 True Sylvania Bad Boys. Chromed Foil Power. Real 1940s build.

***Please read the entire listing thoroughly and ask any questions prior to purchase***

★★★ Amazing Historic Vintage Tubes ★★★

Production Year: Emporium, PA - 1951

Matched Codes: 139

Green Label

Tall Black Base

Set of Two (2) Tubes

***The Tubes Pictured are the Tubes Offered***

Made In the U.S.A.

★★★ These Tubes are Very Rare in Brand New Condition ★★★

BEST TUBES ON THE MARKET... NO LEAKS... NO SHORTS...

★★★ HICKOK TESTED ★★★

Tested on Hickok 750 for Emission, Mutual Conductance

Where 50 (μ) is Good these tubes peg at 76/77 for Emission

Where 2,600 (ma/V) is Good these tubes peg at 3,200/3,300 for Mutual Conductance

Tube 1. Plate 1. - 76 (μ) - 3,300 (ma/V) at Idle -…