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GE

6AS7GA GE NOS NIB Military Green Label Matched Quad for OTL Amplifiers – Direct 6080 Replacement – AMPLITREX Tested USA ’86

6AS7GA GE NOS NIB Military Green Label Matched Quad for OTL Amplifiers – Direct 6080 Replacement – AMPLITREX Tested USA ’86

€239,80 EUR
€239,80 EUR
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6AS7GA GE NOS NIB Military Green Label Matched Quad for OTL Amplifiers – Direct 6080 Replacement – AMPLITREX Tested USA ’86

This quartet is designed for OTL amplifiers, high-current stereo amplifiers, or configurations employing four output tubes, where electrical uniformity, operational stability, and consistency among all tubes significantly contribute to overall performance and channel balance.

Description:

One of the last true military-grade American 6AS7GA tubes, specifically selected and tested for high-performance OTL amplifiers and high-reliability audio systems.

Thanks to their high current capability and remarkable operational stability, these tubes are a particularly attractive choice for OTL headphone amplifier enthusiasts and for audio systems using the 6AS7 / 6080 family.

This military production General Electric 6AS7GA represents a conscious, technical, and durable choice, significantly superior to modern production in terms of build quality, electrical stability, and sonic coherence.

These are authentic NOS, never used, sourced from DLA (Defense Logistics Agency) military stock, manufactured in the USA in 1986 at the GE Owensboro, Kentucky plant: one of the last truly specialized American sites for the production of high-current power tubes.

NOS Military Stock – direct replacement for 6080

🎧 Compatibility with OTL Amplifiers

These GE 6AS7GA tubes belong to the 6AS7 / 6080 family and can be used in numerous OTL amplifiers designed for such tubes or compatible equivalents, including various Feliks Audio, DarkVoice, La Figaro, Woo Audio, Atma-Sphere models, and other dedicated OTL projects.

Final compatibility always depends on the specific design of the device and the manufacturer's recommendations. If in doubt, we recommend checking the amplifier's manual before purchasing.

Why choose this GE 6AS7GA

✔ American military production, not civilian
✔ Black plates and oversized internal structure
✔ Real selection and matching, designed for OTL use
✔ Superior current stability compared to common 6080s and modern productions
✔ Professional Amplitrex AT-1000 test, not generic instruments

This is not a "6080 alternative", but a fully mature 6AS7GA, designed to operate for a long time, safely, and with predictable electrical behavior in serious OTL circuits.

Tonal characteristics and sonic description

Bass
Authoritative and well-founded. The bass range is deep, full-bodied, and perfectly controlled, capable of imparting weight and realism without compromising precision and speed.

Midrange
Soft, natural, and three-dimensional. Vocals emerge with warmth and naturalness; acoustic instruments and piano sound present and credible.

Treble
Clean, sweet, and never aggressive. The extension is wide and smooth, with a refined brilliance that adds air and transparency without fatigue.

Dynamics
Fluid, coherent, and free of rigidity. Micro and macro dynamics are reproduced naturally, without compression or hardening.

Soundstage
Wide, stable, and deep, with precise focus and a perfectly balanced soundstage thanks to accurate matching.

🎧 Use in OTL Hi-Fi Amplifiers

Ideal for mid-to-high-end 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 capability
• long-term stability
• predictable electrical behavior

Also excellent as regulator tubes or power buffers.

🎸 Use in Musical Amplifiers

Also appreciated in professional settings for low noise and controlled harmonic rendition, the GE 6AS7GA offers a warm, solid, and stable tone, suitable for studio preamplifiers and vintage tube compressors.

🎯 Note for audiophiles and collectors

• GE – Owensboro, Kentucky production
• 1986 – last period of true quality American military production
• NOS NIB – New Old Stock, New In Box
• Military green GE silkscreen
• Domed chrome getter
• Never used tubes, perfectly preserved

Manufacturing code: 86-48 (48th week of 1986 – RMA/EIA Open Date Code)

A reliable, stable, and musically mature selection, designed for those who use serious OTL amplifiers and desire an authentic 6AS7GA quartet, capable of ensuring uniform operation, long life, and consistent performance over time without compromises with modern production.

Professional testing and selection

All tubes are tested and matched by us on Amplitrex AT-1000, with a double control procedure:

• Pre-selection at fixed bias to check linearity, symmetry, and absence of defects
• Test in Auto Bias to simulate real operating conditions in OTL circuits

✔ VERY STRONG emission
✔ Well-balanced internal sections
✔ Matched quad with consistent behavior among all tubes
✔ No shorts, gas, or instability

Test results (for technicians and professionals)

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

Additional tests
• Microphonics: standard, suitable for hi-fi and musical use
• Emission: excellent, stable, without fluctuations
• Shorts and gas: absent

OTL Set (8–12 tubes) → upon request / dedicated selection

Discover why our tubes are different →

Condizioni di vendita e sicurezza

Anti-Tamper Security Seal Policy:
Each product is sealed to guarantee quality and integrity.
The right of withdrawal is subject to the seal remaining intact, as provided for by the Consumer Code.

Eco-Friendly Packaging:
The tube will be shipped with protective packaging to ensure safety during transport.
We use recycled and recyclable paper for packaging, along with brown ECO-KRAFT adhesive tape, eco-friendly and solvent-free.

Important Notes:
This tube, manufactured according to the standards of its era, is designed to operate in equipment compatible with vintage tubes.
It is recommended to follow standard safety guidelines to avoid malfunctions or damage.

Safety Assurance:
Although not tested according to modern GPSR regulations, this tube was designed to operate safely under the conditions for which it was manufactured.
We recommend using it only with equipment that supports vintage tubes, in order to avoid risks of malfunction or damage.
Technical data note:
In some cases, the technical data provided may be based on datasheets from other manufacturers or on equivalent historical specifications, when a specific official datasheet for the production batch of the listed item is not available.
Electrical characteristics may vary slightly depending on the production batch and manufacturing period, as is typical for thermionic components.

Safety Information:
Warning: Keep out of reach of children.
To be used under adult supervision.
Use the product only with equipment designed for vintage tubes.

Shipping & Returns

Shipping & Returns

Shipping Costs

Shipping costs vary depending on the total amount of the items in the cart and are calculated automatically during the checkout process.
All shipments are fully insured. The courier is automatically selected based on destination, weight, and shipment characteristics.

Shipping Times and Delivery

The indicated delivery times are purely indicative.
Any delays, storage issues, or operational changes made by the carrier (for example during peak periods such as holidays) are not attributable to Vacuum Tubes Treasures.

In such cases, we will nevertheless provide the Customer with all necessary support to open claims or assistance requests with the appointed courier.

International Shipping (Non-EU Countries)

For orders shipped to countries outside the European Union, any customs duties, import taxes, or additional charges are the sole responsibility of the recipient.
Vacuum Tubes Treasures has no control over these costs, which may vary from country to country. Customers are therefore advised to contact their local customs authorities prior to placing an order.

Warranty

All products sold by Vacuum Tubes Treasures are covered by the legal warranty of conformity, in accordance with Italian Legislative Decree No. 206/2005 (Consumer Code) and the Italian Civil Code (Articles 1490 et seq.), under the conditions set out below.

Warranty for Vacuum Tubes

Vacuum tubes, being components subject to wear and of vintage or specialized nature, are covered by a specific warranty of 6 (six) months from the date of delivery.
The warranty covers exclusively proven manufacturing or conformity defects that arise during proper use in accordance with technical specifications.

The warranty does not cover:

  • normal wear and tear,
  • subjective sound preferences,
  • use in incompatible equipment,
  • tampering or improper use.

Right of Withdrawal

Purchases made on the Vacuum Tubes Treasures website are governed by Italian regulations on distance contracts (Legislative Decree No. 206/2005).

Consumers have the right to withdraw from the contract within 14 (fourteen) days from the date of receipt of the goods, without providing any reason.

Conditions for Exercising the Right of Withdrawal

The right of withdrawal may be exercised only if:

  • the product has not been used,
  • the product is returned in its original condition,
  • the tamper-evident security seal is intact and not broken.

📌 Returns are not accepted for reasons related to sound preference, tube rolling, or subjective audio evaluation.
As with a music recording, a vacuum tube cannot be returned simply because its sound does not match personal taste.

Effects of Withdrawal

In the event of a valid withdrawal:

  • all payments received, including standard shipping costs, will be refunded,
  • refunds will be issued within 14 days from receipt of the returned goods,
  • the refund may be withheld until the goods have been received and inspected.

Refunds will be made using the same payment method used for the original transaction, unless otherwise agreed.

Return Shipping Costs

Return shipping costs are borne by the Customer, except in cases of:

  • verified defective products,
  • errors attributable to Vacuum Tubes Treasures.

In such cases, return shipping costs will be fully covered by us.

Damaged or Incorrect Items

If the Customer receives a damaged or incorrect item, it must be reported within 5 (five) working days from delivery, by email or telephone, clearly stating the issue.

Uncollected Parcels, Storage, and International Shipments

It is the Customer’s responsibility to monitor the shipment and promptly arrange for collection or customs clearance.
Any costs, delays, or losses resulting from:

  • failure to collect the parcel,
  • prolonged storage,
  • abandonment of the parcel at customs,

do not entitle the Customer to any refund.

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.