RCA 6SN7GT Black Plates Preamp Driver 1962 - Tested

Superior Sound Supply selling some seriously special stock. This is a pristine example of the highly sought-after RCA 6SN7GT with flat black plates and bottom getter, preserved in its original Radiotron box. Known for their lush midrange and authoritative bass response, these early US-made dual triodes are a premium choice for vintage Hi-Fi drivers and line stages.

Technical Specs

• Brand: RCA (Radio Corporation of America)

• Model: 6SN7GT

• Date Code: MW (Early 1950s Production)

• Plate Type: Flat Black Plates

• Getter: Bottom Getter

• Test Results (Triode 1): [88%] (Tested on Precision 612)

• Test Results (Triode 2): [90%] (Tested on Precision 612)

• Shorts/Leakage: Passed

• Noise: Tested for microphonics and noise

Condition Details

This tube is in exceptional cosmetic condition. The black phenolic base is glossy, and the signature gold RCA lettering is vibrant and fully intact—rare for tubes of this era. The glass is clear with tight internal structures. The pins show typical mild oxidation from decades of storage but are straight and solid. It comes in its original red and black RCA box, which shows shelf wear and some tearing on the top flap but remains structurally sound.

Historical Context

The flat black plate RCA 6SN7GT is often regarded as one of the definitive American audio tubes. Produced before the introduction of the later GTB versions, these tubes feature a construction that many audiophiles believe offers a more natural, organic tone compared to later grey plate or coin base iterations. They are a favorite "tube rolling" upgrade for modern and vintage preamplifiers.

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