RCA 6SN7GTB Preamp Tube 1960 USA - Tested

Superior Sound Supply selling some seriously special stock. This is a vintage RCA 6SN7GTB, a classic American dual triode featuring the highly desirable black Plates construction and side D-getter. Known for their rich midrange warmth and detailed high-end extension, these black Plates RCAs are a staple for audiophiles and guitarists looking to capture authentic vintage tone.

Technical Specs

• Brand: RCA
• Model: 6SN7GTB
• Type: Dual Triode
• Construction: Black Ladder Plates, Side D-Getter
• Date Code: LH
• Test Results: Passed for Shorts, Opens, and Leakage
• Emission Scores: Triode 1: 86% Triode 2: 82%
• Base: 8-Pin Octal (Black Bakelite)

Condition Details This tube is in excellent structural and functional condition. The glass envelope is clear, displaying the distinct "6SN7 GTB" etching within the hexagon border. The silver base printing shows typical signs of age but remains legible. The base is solid with no looseness, and the pins are straight and free of oxidation. Internally, the black Plates are secure, and the side getter flash indicates a healthy vacuum.

Historical Context The GTB series of the 6SN7 family was engineered for higher Plates voltages and controlled warm-up times, offering improved reliability over earlier GT versions while maintaining backward compatibility. This era of RCA production, characterized by the black Plates and silver base text, is widely considered the sweet spot for tone, offering a more musical and "3D" soundstage compared to later Gray-Plates variants.

Superior Sound Supply Guarantees Quality Assurance: Transparency and accuracy are the cornerstones of our business. We ensure every component is vetted so you can buy with complete confidence. Along with Superior Supplies for all of your sounds, We stand on Superior Service, If your not satisfied with our supply we will make it right.

Shipping: Carefully packaged with consistent methods that are proven to protect your item and ensure safe delivery. We primarily use USPS, and FedEx for large or high-value items, and can arrange international shipping to anywhere in the world. Orders are processed and shipped within 1-3 business days of payment clearance. We do not ship on weekends or federal holidays. Orders placed after 2:00 PM CST Friday will ship the following Monday.

Returns:

• New Items: Returnable within 30 days of delivery.
• Used & Vintage Items: Returnable within 30 days of delivery.

General Terms Items must be returned in original, as-shipped condition with all original packaging and no signs of use. Buyer assumes responsibility for all return shipping costs unless the item was not received as described.

Make sure to check the return policy on each individual listing as some items may be sold "As-Described" and not eligible for a return. We want you to be completely satisfied with your purchase.