12AX7 / ECC83 NOS Baldwin by SYLVANIA Gray Plates Halo Getter Red Tip Tested Balanced Tube Made in USA

12AX7 / ECC83 NOS Baldwin by SYLVANIA Gray Plates Halo Getter Made in USA 1960

AMPLITREX Tested – Low Noise & Microphonics – Vintage American Sylvania Production

General Description

This 12AX7 / ECC83 Baldwin by Sylvania, produced in the United States in 1960, represents one of the most appreciated American interpretations of the renowned ECC83.

Tubes branded Baldwin were intended for high-end electronic organs of the era and were selected by manufacturers who demanded reliability, low noise, and long operational life. Behind the Baldwin brand, in this case, is the renowned SYLVANIA Made in USA production, recognizable by its construction with Gray Plates and Halo Getter, a configuration particularly valued by enthusiasts for its tonal balance and natural musicality.

Early 1960s Sylvania Gray Plates are known for their ability to combine detail, openness, and naturalness, offering an engaging yet never artificial reproduction.

This tube has been carefully verified using AMPLITREX AT-1000, resulting in VERY STRONG performance, exceeding nominal reference values.

Aesthetically, it is in excellent condition, with a well-preserved internal structure and legible lettering.

Sonic Characteristics

Baldwin by Sylvania Gray Plates possess the typical high-quality American sonic character, distinguished by balance, musicality, and excellent intelligibility.

Bass

The bass is well-controlled and defined, with good presence and articulation. It provides a solid low end without weighing down the musical message.

Mids

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