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GE

6AS7GA / 6080 GE NOS NIB Green Label Matched Quad for OTL Amplifiers AMPLITREX Tested USA ’86

6AS7GA / 6080 GE NOS NIB Green Label Matched Quad for OTL Amplifiers AMPLITREX Tested USA ’86

₩303,000 KRW
₩303,000 KRW
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6AS7GA / 6080 GE NOS NIB Military Green Label – Matched Quad for OTL Amplifiers – Made in USA 1986

Direct 6080 Replacement – AMPLITREX Tested – VERY STRONG – High-Current OTL Matching at 55 mA

Description

Not just a "matched" quad: four GE 6AS7GA NOS NIB selected on Amplitrex at high current to offer stability, uniformity, and consistent performance in compatible OTL applications.

Designed for OTL amplifiers, headphone amplifiers, and circuits of the 6AS7 / 6080 family, this quad is selected at 55 mA per section in Auto Bias to verify the tubes' behavior under demanding conditions and identify electrically very consistent specimens.

The final matching is performed by primarily comparing the grid voltage (Vg) required for each section to reach the same anode current of 55 mA, with Gm used as an additional parameter for electrical consistency.

The tubes received a VERY STRONG rating, with stable emission, well-balanced sections, consistent behavior between the two tubes, and no shorts, gas, or instability.

These are authentic GE NOS NIB – New Old Stock, New In Box – never used, from military DLA – Defense Logistics Agency stock. Manufactured by General Electric, Made in USA 1986, Owensboro, Kentucky plant, with GE military green silkscreen and original packaging.

The construction features black plates, robust internal structure, and a domed chrome getter. The manufacturing code 86-48 identifies the 48th week of 1986.

Sonically, they offer a solid and musical performance, with full and controlled bass, natural mids, sweet highs, and fluid dynamics.

Ideal for those looking for an American NOS quad selected for:

• OTL headphone amplifiers
• compatible OTL amplifiers
• equipment designed for 6AS7GA / 6080
• high-current hi-fi circuits
• power regulators and buffers

A GE NOS military quad truly tested and selected by Vacuum Tubes Treasures, designed for those seeking authentic, strong, stable 6AS7GA tubes ready for serious OTL applications.

Test Results

Tubes tested on AMPLITREX AT-1000 Tube Tester

Test Conditions
Va = 230V
Vg = Auto Bias
Target anode current: 55 mA per section
Dissipation: approx. 12.6 W per section
Warm-Up: ≥ 600 seconds for cathode thermal stabilization

Note on matching protocol:
The conditions indicated above constitute the selection point used by VTT to verify the tubes' behavior at high current. They do not necessarily represent the operating point of the specific amplifier, which depends on the design and the relative bias circuit.

Tube #16

  • Section 1 → Gm = 3250 ; Ia = 55 mA ; Vg = -115 V
  • Section 2 → Gm = 3470 ; Ia = 55 mA ; Vg = -111 V

Tube #17

  • Section 1 → Gm = 3450 ; Ia = 55 mA ; Vg = -110 V
  • Section 2 → Gm = 3320 ; Ia = 55 mA ; Vg = -113 V

Tube #20

  • Section 1 → Gm = 3160 ; Ia = 55 mA ; Vg = -117 V
  • Section 2 → Gm = 3640 ; Ia = 55 mA ; Vg = -110 V

Tube #3

  • Section 1 → Gm = 3180 ; Ia = 55 mA ; Vg = -112 V
  • Section 2 → Gm = 3500 ; Ia = 55 mA ; Vg = -113 V

Custom matching for OTL amplifiers

We have a large stock of NOS GE 6AS7GA tubes and can prepare, upon request, selected and carefully matched sets larger than a quad, including pairs, quads, octets, and larger configurations, for the most demanding OTL applications.

Availability may vary. We invite you to contact us before purchasing to check the feasibility of your desired configuration.

Discover why our tubes are different →

Terms of Sale & Safety

Sales Terms & Product Safety

Each vacuum tube is carefully selected, tested, and verified in our laboratory before shipment. Where stated in the listing, test results, matching data, and declared characteristics refer to measurements performed using the specified test equipment and operating conditions.

Sound descriptions are provided for guidance only and reflect the characteristics generally associated with that particular tube type. Personal sound preferences, tube rolling, or perceived differences between audio systems do not constitute a product defect.

Before installation, please verify the tube’s electrical and mechanical compatibility with your equipment and follow the manufacturer’s instructions.

New production and NOS tubes are shipped with a tamper-evident security seal and internal technical documentation to ensure traceability of the product’s condition at the time of shipment.

Product Safety (GPSR)

Vacuum tubes are electronic components intended exclusively for use in compatible equipment and must be installed in accordance with the equipment manufacturer’s instructions.

Due to their historical or vintage nature, certain technical specifications may be based on original datasheets or equivalent technical documentation when documentation from the specific manufacturer is unavailable.

Use only with suitable equipment. Keep out of reach of children.

Shipping & Returns

Shipping & Returns

We ship worldwide using carefully selected express carriers and protective packaging specifically designed for vacuum tubes.

If you change your mind, you may exercise your right of withdrawal within 14 days of delivery, where applicable under the relevant consumer protection laws. The product must be returned complete with its original packaging and accessories, in the same commercial condition in which it was received. Return shipping costs are the responsibility of the customer.

Every returned item undergoes a technical inspection. Installation, use, tube rolling, or any other handling may reduce the product’s commercial value and may affect the refund amount, in accordance with applicable law.

If you believe the product has a lack of conformity, our laboratory will carry out the necessary inspections and apply the remedies provided by the applicable consumer protection legislation.

For further details, Customers are invited to consult the “Terms and Conditions” and “Refund Policy” sections of our website, or to contact us before placing an order.

Vacuum Tubes Treasures
www.vtt.store | www.vacuumtubestreasures.com
📧 info@vacuumtubestreasures.com

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  • ATTENTION PLEASE

    Please understand that the writing on the glass of vintage valves has become very delicate over the years and comes off easily. You must handle them with extreme care to avoid this. Wear and damage to the writing on the valves reduces their market value and causes damage. Please exercise extreme caution.

  • ATTENTION PLEASE

    We wish to inform you that any attempts to manipulate shipping destination information in order to obtain lower shipping rates may be considered fraudulent acts. Please provide accurate information and contact us if you have any concerns. We reserve the right to review and, if necessary, cancel orders that we deem to be in violation of our conditions. Thank you for your understanding and cooperation.