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GE

JG-12AT7 / ECC81 GE Matched Pair Gray Wing Plates Square Tilt Getter Made in USA '55

JG-12AT7 / ECC81 GE Matched Pair Gray Wing Plates Square Tilt Getter Made in USA '55

24.100 HUF
24.100 HUF
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JG-12AT7 / ECC81 GE Matched Pair Gray Wing Plates Square Tilt Getter Made in USA '55

Description:

This matched pair of General Electric JG-12AT7 / ECC81 , Made in USA 1955 , belongs to the JG (Joint Army–Navy) series, built to extremely stringent military specifications. The construction with gray wing plates and square tilt getter identifies one of the most solid and reliable variants of the 1950s GE 12AT7, today particularly sought after for its stability and balanced sound reproduction.
The tubes are Tested STRONG and selected as a Matched Pair , offering consistent behavior and an immediate feeling of quality and robustness typical of American military production.

Sound Characteristics

Bass
Tight, controlled, and well-articulated. The low range is precise and organized, with an excellent ability to maintain rhythm and structure even in the most complex passages.

Medium
Clean, natural, and well-defined. Voices are centered and clear, with a very balanced reproduction that enhances acoustic instruments and well-recorded sound.

High
Clear, open, and uncluttered. The highs are bright but never aggressive, with an elegant definition that adds air and detail without being overwhelming.

Dynamics
Prompt and controlled. The response is reactive and stable, with fluid microdynamics that make the music lively and coherent.

Soundstage
Stable and well-focused. Good instrument separation and a clear image, with a solid and realistic presentation.

🎧 Use in Hi-Fi Stereo Amplifiers
Ideal for:

  • preamplifiers and line stages,
  • drivers and medium gain stages,
  • vintage and modern hi-fi amplifiers using ECC81.

The JG military selection guarantees reliability and consistency of behavior over time.

🎸 Use in Music Amplifiers
Excellent for:

  • guitar amplifiers and instruments,
  • driver positions
  • circuits that require rapid response and signal control.

They offer definition, stability and a clean, authoritative sound character.

🎯 Note for audiophiles and technicians

An ideal pair for those looking for a solid, precise and musically coherent ECC81 , capable of enhancing hi-fi systems and musical amplifiers with the classic GE rigour of the golden years.

Test Results:

Valves tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -2V
  • Average 100%: Gm = 5.5 ; Ia = 10 mA
  • Test Result: STRONG

Valve 1:

  • Section 1: Gm = 4.6, ; Ia = 8.2 mA
  • Section 2: Gm = 4.7 ; Ia = 7.8 mA

Valve 2:

  • Section 1: Gm = 4.6 ; Ia = 8.8 mA
  • Section 2: Gm = 4.7 ; Ia = 7.6 mA
Additional Tests Performed:
  • Microphonics: Low. Tested and approved for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.
  • Output Quality: Excellent – Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Condition: Vintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.
  • Functionality: Fully functional.
  • Cosmetic condition: Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.
  • Manufacturing Code: None. Year of manufacture detected by the internal structure - Manufactured in the 1960s

Find out why our valves 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.