12AX7 / ECC83 Knight by Westinghouse Short Gray Plates Square Getter Tube Made in USA '50s

12AX7 / ECC83 Knight by Westinghouse Short Gray Plates Square Getter Tube Made in USA '50s AMPLITREX Tested – STRONG – Low Noise & Microphonics – Vintage American Westinghouse Production Description: This 12AX7 / ECC83 branded Knight, produced by Westinghouse in the USA in the 1950s, is a valuable testament to the best American production of the era, when numerous commercial brands relied on major US manufacturers for professional-quality tubes. The construction with Short Gray Plates and Square Getter identifies a typical configuration of Westinghouse productions from the late 1950s, appreciated for its reliability, robust construction, and balanced musicality. This tube has been carefully checked using an AMPLITREX AT-1000 Tube Tester, resulting in STRONG emission, with stable output and regular electrical behavior. The Low Noise & Microphonics selection makes it particularly interesting for audio applications where quietness and operational reliability are important. Sonic Characteristics Westinghouse ECC83s from this period are generally appreciated for their balanced and musical character, with a natural and uncolored presentation. Bass The bass range is well-controlled and accurately articulated, with good presence and always an orderly response. Mids The mids are natural and well-focused, with good vocal intelligibility and a balanced harmonic rendering of acoustic instruments. Highs The high range is clean and pleasantly extended, with good detail and absence of harshness. Dynamics The dynamic response is fluid and coherent, capable of effectively following musical variations without sounding compressed. Soundstage The soundstage appears well-organized, with correct instrument separation and a credible presentation of the acoustic space. 🎧 Use in Hi-Fi Amplifiers This 12AX7 / ECC83 is particularly suitable for: tube preamplifiers line stages compatible phono stages integrated amplifiers driver stages restorations of vintage American electronics The Low Noise & Microphonics selection also makes it suitable for sensitive circuit positions. 🎸 Use in Musical Applications In guitar amplifiers and other compatible musical applications, this Westinghouse offers: good note definition natural and present mids balanced dynamic response low noise These characteristics make it interesting for both vintage amplifiers and boutique projects inspired by classic American sounds. 🎯 Note for Audiophiles The Westinghouse Made in USA productions of the 1950s represent an important part of American tube history. The combination of: original USA Westinghouse production Knight branding Short Gray Plates Square Getter Low Noise & Microphonics STRONG emission well-balanced sections makes this tube an interesting choice for those who desire an authentic, reliable, and musically balanced American ECC83. A selected vintage example that preserves the charm and solidity of American electronic tradition from the golden age. Test Results Tested on AMPLITREX AT-1000 Tube Tester Voltage Test: Va = 250V, Vg = -2V Average 100%: Gm = 1600 ; Ia = 1.2 mA TEST RESULT: STRONG Tube : Section 1: Gm = 1300 ; Ia = 0.8 mA Section 2: Gm = 1400 ; Ia = 0.9 mA Additional Tests Performed: Microphonics: Low. Tested and suitable for use in hi-fi, even in phono stages and guitar amplifiers. Also suitable for V1. Balance: Good. The sections show consistent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between sections is not required. Emission Quality: Strong – Strong and regular emission, suitable for any application. Shorts and GAS: Absent. Condition: Condition: Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection. Functionality: Perfectly operational. Cosmetic Condition: Good – Markings partially eroded, but still legible. Tube body in good condition. See photos for details. Manufacturing Code: 337 304 → RMA/EIA Open Date Code → manufactured the 04th week of 1953 - 337 → Westinghouse Electric Corporation, Baltimore 3, Md. Discover why our tubes are different →