6AS7GA GE NOS NIB Black Plates Military Green Label Matched Quad AMPLITREX Tested Made in USA '86
This quartet is intended for stereo OTL amplifiers or balanced configurations using four power tubes, where electrical coherence and stability between channels are crucial.
Description:
One of the last true American military grade 6AS7GAs , selected and tested specifically for high reliability audio OTL applications.
This military-grade General Electric 6AS7GA represents a conscious, technical and long-lasting choice, clearly superior to modern production in terms of construction quality, electrical stability and sonic coherence .
We are talking about authentic NOS , never used, coming from DLA (Defense Logistics Agency) military stock , produced in the United States in 1986 at the GE plant in Owensboro, Kentucky : one of the last American sites truly specialized in the production of high current power valves.
NOS Military Stock – direct replacement for 6080
Why choose this 6AS7GA GE
✔ US military production , not civilian
✔ Black plates and oversized internal structure
✔ Real selection and matching , designed for OTL use
✔ Higher current stability than common and modern 6080 productions
✔ Professional Amplitrex AT-1000 test , not generic tools
This is not an “alternative 6080” , but a fully mature 6AS7GA , designed for long, safe, and predictable electrical operation in serious OTL circuits.
Timbre characteristics and sound description
Bass
Authoritative and well-grounded. The low end is deep, full-bodied, and perfectly controlled, capable of imparting weight and realism without compromising precision and speed.
Medium
Soft, natural, and three-dimensional. The voices emerge with warmth and naturalness; acoustic instruments and piano are present and believable.
High
Clean, sweet, and never aggressive. The extension is broad and even, with a refined brilliance that adds air and transparency without overpowering.
Dynamics
Fluid, coherent, and free of rigidity. Micro and macrodynamics are restored naturally, without compression or hardening.
Soundstage
Wide, stable and deep, with precise focus and perfectly balanced soundstage thanks to the accurate matching of the quartet.
🎧 Use in OTL Hi-Fi Amplifiers
Ideal for mid-high and high-end OTL (Output Transformerless) amplifiers such as Atma-Sphere , Feliks Audio , DarkVoice , as well as for serious custom projects, where the following are required:
• high current capacity
• stability over time
• predictable electrical behavior
Matched Quad configuration recommended for OTL stereo and projects requiring perfect coherence between channels.
🎸 Use in Music Amplifiers
Also appreciated in the professional field for their low noise and controlled harmonic output , the GE 6AS7GA offer a warm, solid and stable tone, suitable for studio preamps and vintage tube compressors.
🎯 Note for audiophiles and collectors
• GE Manufacturing – Owensboro, Kentucky
• 1986 – last period of true quality American military production
• NOS NIB – New Old Stock, New In Box
• GE military green screen printing
• Domed chrome getter
• Never used valves, perfectly preserved
Manufacturing Code: 86-48 (48th week of 1986 – RMA/EIA Open Date Code)
A reliable, stable and musically mature quartet , designed for those who use serious OTL amplifiers and want an authentic 6AS7GA , capable of lasting over time without compromise with modern production .
Professional testing and selection
All valves are tested and matched by us on Amplitrex AT-1000 , with double control procedure :
• Fixed polarization pre-selection for linearity, symmetry and defect-free verification
• Auto Bias testing to simulate real operating conditions in OTL circuits
✔ VERY STRONG output
✔ Well-balanced internal sections
✔ Matched quartet with consistent behavior
✔ No shorts, gases or instability
Test results (for technicians and professionals)
Valve #16
Section 1 → Gm = 3250 ; Ia = 55 mA ; Vg = 115 V
Section 2 → Gm = 3470 ; Ia = 55 mA ; Vg = 111 V
Valve #17
Section 1 → Gm = 3450 ; Ia = 55 mA ; Vg = 110 V
Section 2 → Gm = 3320 ; Ia = 55 mA ; Vg = 113 V
Valve #20
Section 1 → Gm = 3160 ; Ia = 55 mA ; Vg = 117 V
Section 2 → Gm = 3640 ; Ia = 55 mA ; Vg = 110 V
Valve #3
Section 1 → Gm = 3180 ; Ia = 55 mA ; Vg = 112 V
Section 2 → Gm = 3500 ; Ia = 55 mA ; Vg = 113 V
Additional tests
• Microphonics: standard, compliant for hi-fi and musical use
• Emission: excellent, stable, without fluctuations
• Shorts and gas: absent
OTL Set (8–12 tubes) → available on request / dedicated selection
Find out why our valves are different →
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