12AU7A / ECC82 NOS Baldwin by SYLVANIA Long Gray Plates Halo Getter Matched Pair Tubes Made in USA '60s

12AU7 / ECC82 NOS Baldwin by SYLVANIA Matched Pair Long Gray Plates Halo Getter AMPLITREX Tested Made in USA ’60 AMPLITREX Matched Pair – Low Noise & Microphonics – Vintage American SYLVANIA Production Description This matched pair of 12AU7 / ECC82 NOS Baldwin by Sylvania, Made in USA 1960 production, represents a high-level American selection, designed for hi-fi and musical applications where consistency between tubes, low noise, and operational stability are fundamental aspects. Tubes branded Baldwin were intended for musical and professional applications, particularly quality electronic organs, where reliable, stable, and quiet tubes were required. Behind the Baldwin brand, in this case, we find Sylvania Electric Products Inc. production, recognizable by the construction with Long Gray Plates and Halo Getter. The pair comes from the same manufacturing code 312 052, traceable to the 52nd week of 1960. This element adds technical and collectible value, offering great production consistency between the two specimens. The tubes are in NOS – New Old Stock condition, tested and selected using an AMPLITREX AT-1000 Tube Tester as a Matched Pair, with an overall result of VERY STRONG, low microphonics, low noise, and 48h Burning Test passed. The strength of this pair is not just their very solid electrical state, but above all the consistency of values between the two tubes, a characteristic particularly important in stereo preamplifiers, line stages, and applications where uniformity between channels is desired. From an aesthetic point of view, the pair is in excellent condition, with well-preserved lettering, clean internal structure, and minimal signs of age. See photos for details. Tonal Characteristics and Sound Description Sylvania Long Gray Plates from the early 60s are appreciated for a balanced, open, and natural sound reproduction, with a very recognizable American musicality. In this matched pair selection, the consistency between the two tubes contributes to a stable, orderly, and very pleasant presentation, ideal for quality stereo systems. Bass The bass range is controlled, articulated, and well-supported. It offers a solid foundation without being intrusive, maintaining rhythm and clarity even in the most complex passages. Mids Mids are natural, clear, and musical. Vocals and acoustic instruments are well-focused, with a balanced and pleasing harmonic texture. Highs The high range is open and clean, with good extension and a fluid, never aggressive presentation. Detail remains well integrated into the musical message. Dynamics Dynamics are prompt and consistent, with a stable and well-controlled response. The matching of the pair helps maintain uniformity and tonal continuity between the two channels. Soundstage The soundstage appears wide, stable, and well-organized. The consistency of the pair favors correct instrument separation and a balanced presentation of the stereophonic image. 🎧 Use in Stereo Hi-Fi Amplifiers This matched pair is particularly suitable for: stereo tube preamplifiers line stages driver stages integrated amplifiers DAC and tube buffers restorations of vintage American electronics The Low Noise & Microphonics selection also makes it suitable for sensitive applications, including compatible phono stages and positions where silence and channel consistency are essential. 🎸 Use in Musical Amplifiers In musical instrument amplifiers and compatible professional equipment, these 12AU7 / ECC82 Baldwin by Sylvania can offer: excellent operational stability natural harmonic response contained noise low microphonics consistent behavior between the two tubes good signal intelligibility These characteristics make the pair interesting for both studio and live applications, always respecting the technical compatibility of the equipment. 🎯 Note for Audiophiles and Technicians This pair combines elements particularly appreciated by enthusiasts: Sylvania Made in USA production Baldwin brand same manufacturing code 312 052 1960 production Long Gray Plates Halo Getter Matched Pair 48h Burning Test – OK Low Noise & Microphonics VERY STRONG performance on both tubes A high-level selection for those who want a truly consistent, quiet, and stable pair, capable of offering the charm of vintage American production with modern, accurate, and documented verification. Test Results Tubes tested on AMPLITREX AT-1000 Tube Tester Test Conditions: Va = 250V, Vg = -8.5V Average 100%: Gm = 2200; Ia = 10.5 mA Test Result: VERY STRONG Tube #11 Section 1: Gm = 2300; Ia = 9.4 mA Section 2: Gm = 2320; Ia = 10.2 mA Tube #21 Section 1: Gm = 2300; Ia = 10.2 mA Section 2: Gm = 2400; Ia = 10.4 mA Additional Tests Performed Burning Test: 48h – OK Microphonics: Low. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1 position. Balance: The sections are consistent and well-aligned, making the tubes suitable for use as phase inverters in hi-fi and instrumental applications. Emission Quality: Excellent – very strong and stable emission, without fluctuations. Shorts and GAS: Absent. Condition Condition: NOS – New Old Stock – tested and working. Supplied in our custom box for optimal protection. Functionality: Perfectly operational. Aesthetic Condition: Excellent – lettering perfectly preserved, minimal signs of age. See photos for details. Manufacturing Code: 312 052 → 312 indicates the manufacturer, which is Sylvania Electric Products Inc., Emporium, Pennsylvania. 052 → 0 indicates 1960, 52 indicates the 52nd week of the year. Discover why our tubes are different – the VTT protocol that improves sound, reliability, and durability →