12AU7A / ECC82 NOS Baldwin by SYLVANIA Long Gray Plates Halo Getter Tested Tube Made in USA '60s

12AU7A / ECC82 NOS Baldwin by SYLVANIA Long Gray Plates Halo Getter Tested Tube Made in USA '60sAMPLITREX Tested – Low Noise & Microphonics – Guitar Amp Grade – Vintage American SYLVANIA ProductionDescriptionThis 12AU7 / ECC82 NOS Baldwin by Sylvania tube, Made in USA in 1960, represents a classic American tube from the golden age of US tube production.Tubes branded Baldwin were intended for professional musical applications, particularly high-end electronic organs, where reliability, stability, and durability were fundamental requirements. Behind the Baldwin brand, in this case, we find the renowned production of Sylvania Electric Products Inc., recognizable by the typical construction with Long Gray Plates and Halo Getter.This tube has been tested with an AMPLITREX AT-1000 Tube Tester, resulting in VERY STRONG emission, with low noise, contained microphonics, and successfully passed the Burning Test.The electrical performance is very high, with emission exceeding nominal reference values. The sections show a slight imbalance, a characteristic that does not limit its use in the intended applications but makes this particular sample interesting for musical uses and for positions not critical to section symmetry.For this reason, the tube is particularly recommended for guitar amplifiers, in positions like V2, V3, and V4, where musicality, reliability, and tonal character are often more important than perfect electrical symmetry.Tonal characteristics and sonic descriptionSylvania Long Gray Plates from the early 1960s are appreciated for a balanced, open, and natural sound, with a very recognizable American musicality.In this matched pair selection, the consistency between the two tubes contributes to a stable, orderly, and very pleasing presentation, ideal for quality stereo systems.BassThe low range is controlled, articulate, and well-supported. It offers a solid foundation without being intrusive, maintaining rhythm and clarity even in complex passages.MidsThe mids are natural, clear, and musical. Vocals and acoustic instruments are well-focused, with a balanced and pleasing harmonic texture.TrebleThe high range is open and clean, with good extension and a fluid, never aggressive, presentation. Detail remains well integrated into the musical message.DynamicsDynamics are prompt and consistent, with a stable and well-controlled response. The pair's matching helps maintain uniformity and timbral continuity between the two channels.SoundstageThe soundstage appears wide, stable, and well-organized. The consistency of the pair favors proper instrument separation and a balanced presentation of the stereophonic image.🎧 Use in Hi-Fi Stereo AmplifiersThe tube can be used in: line stages driver stages tube buffers hi-fi applications compatible with 12AU7 / ECC82 The sections are not perfectly symmetrical, therefore it is not the ideal choice for applications requiring a high level of internal balance between the two sections.🎸 Use in Musical AmplifiersThis is probably the most interesting intended use for this sample.Particularly recommended for: V2 V3 V4 driver stages vintage and boutique amplifiers applications where musicality and reliability are sought The combination of: very strong emission low noise contained microphonics Sylvania Long Gray Plates construction makes it a valid candidate for numerous musical applications.🎯 Note for musicians and techniciansThis tube combines several highly appreciated elements: Sylvania Made in USA production Baldwin brand Long Gray Plates Halo Getter NOS – New Old Stock VERY STRONG emission Low Noise Burning Test OK A particularly interesting selection for those who want a true vintage American tube intended for guitar amplifiers and compatible musical applications.Test ResultsTubes tested on AMPLITREX AT-1000 Tube TesterTest Conditions: Va = 250V, Vg = -8.5V Average 100%: Gm = 2200 ; Ia = 10.5 mA Test Result: VERY STRONGTube #12 Section 1: Gm = 2100 ; Ia = 8.3 mA Section 2: Gm = 2400 ; Ia = 11.4 mA Additional Tests Performed Burning Test: 48h – OK Microphonics: Low. Tested and suitable for hi-fi use, including phono stages, and in 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: Excellent – very strong and stable emission, without fluctuations. Shorts and GAS: Absent. Condition Condition: NOS – New Old Stock – tested and functional. Supplied in our custom box for optimal protection. Functionality: Perfectly operational. Cosmetic Condition: Excellent – markings well 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 →