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RAYTHEON

12AU7 / ECC82 RAYTHEON Matched Pair Long Black Plate Square Getter Tested Tubes USA '57

12AU7 / ECC82 RAYTHEON Matched Pair Long Black Plate Square Getter Tested Tubes USA '57

$131.00 CAD
$131.00 CAD
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12AU7 / ECC82 RAYTHEON Matched Pair Long Black Plate Square Getter Tested Tubes USA '57

Low Noise & Microphonics – STRONG - Vintage American Raytheon Production

Test Results:

Tube tested on an AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -8.5V
  • 100% Average: Gm = 2200 ; Ia = 10.5 mA
  • Test Result: STRONG

Tube #4:

  • Section 1: Gm = 1700 ; Ia = 9.6 mA
  • Section 2: Gm = 1600 ; Ia = 8.8 mA

Tube #1:

  • Section 1: Gm = 1600 ; Ia = 7.4 mA
  • Section 2: Gm = 1800 ; Ia = 8.6 mA
Additional tests performed:
  • Burn-in / Stability Test: 48h – OK
  • Microphonics: Very Low. Tested and compliant for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.
  • Noise: Low and well-controlled. Quiet operation in hi-fi environments and musical amplifiers in the intended positions.
  • Balance: Good. The sections present a consistent balance, fully compatible with use in hi-fi environments and musical amplifiers, in all applications where absolute symmetry between sections is not required.
  • Emission Quality: Strong – Strong and steady emission, suitable for any application.
  • Short Circuits and GAS: Absent.

Description:

A prized pair of 12AU7 / ECC82 Raytheon tubes of American production, manufactured in the 23rd week of 1957 and characterized by the sought-after Long Black Plates and Square Getter construction. The code 280 57-23 identifies the Raytheon Manufacturing Company and precisely documents the origin and manufacturing period of both pieces.

The tubes form an Amplitrex Matched pair selected primarily based on transconductance, the most significant parameter for matching these double triodes. Tube #4 has an average of 1650 µmhos, while Tube #1 reaches 1700 µmhos, with a difference of just 3%. The average plate currents are 9.2 and 8.0 mA respectively: values that are not perfectly identical, but compatible with a match intended for general audio use.

The internal balance is good overall. Tube #4 measures 1700/1600 µmhos and 9.6/8.8 mA, while Tube #1 reaches 1600/1800 µmhos and 7.4/8.6 mA. The sections therefore present a consistent response, even without representing a selection of absolute symmetry. The pair is suitable for preamplifiers, buffers, line stages, drivers, and musical instrument amplifiers, while for particularly critical phase inverter circuits, a selection with even more rigorously balanced sections is preferable.

The 48-hour burn-in confirmed operational stability, with no fluctuations, short circuits, or presence of gas. The very low microphonics and well-controlled noise are a significant strength, making these Raytheons suitable even for the most sensitive audio stages of compatible equipment.

In terms of sound, Raytheon Long Black Plates are appreciated for a dynamic, natural, and full-bodied reproduction, with a rich and well-articulated mid-range, solid low frequencies, and a defined high end without being harsh. In hi-fi systems, they offer musicality, good depth, and a stable soundstage; in guitar amplifiers, they ensure a responsive attack, control, and an authoritative character.

A proposal of significant interest for those seeking an American 1957 Raytheon pair, with Long Black Plates, Square Getter, accurately matched transconductance, very low microphonics, and excellent cosmetic condition: two authentic vintage 12AU7/ECC82s, individually tested and ready for use.

Conditions:

  • Conditions: Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.
  • Cosmetic condition: Excellent – Markings well-preserved, minimal signs of age. See photos for details.
  • Manufacturing Code: 280 57-23 → 280 indicates the manufacturer, Raytheon Mfg. Company, Newton 58, Mass. - 57-23 → RMA/EIA Open Date Code → manufactured the 23rd week of 1957

Find out 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.

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  • ATTENTION PLEASE

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