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RCA

12AU7 / ECC82 RCA Black Plates AMPLITREX Tested Square Getter Balanced Made in USA '56

12AU7 / ECC82 RCA Black Plates AMPLITREX Tested Square Getter Balanced Made in USA '56

215.00 ILS
215.00 ILS
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12AU7 / ECC82 RCA Black Plates Square Getter Made in USA '56

AMPLITREX Tested – Low Noise & Microphonics – Balanced – STRONG - Vintage RCA Production

Test Results:

Tube tested on AMPLITREX AT-1000 Tube Tester:

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

Tube:

  • Section 1: Gm = 1700 ; Ia = 8.6 mA
  • Section 2: Gm = 1800 ; Ia = 8.4 mA
Additional Tests Performed:
  • Burn-in / Stability Test: 48h – OK
  • Microphonics: Low. Tested and suitable for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.
  • Noise: Low and well-controlled. Silent operation in hi-fi and musical amplifiers in the intended positions.
  • Balance: Very good. The sections are consistent and well-aligned, making the tube also suitable for use as a phase inverter in hi-fi and instrumental applications.
  • Emission Quality: Strong – Strong and regular emission, suitable for any application.
  • Shorts and GAS: Absent.

Description:

Fine 12AU7 / ECC82 RCA, authentic American production Made in USA from 1956, characterized by the sought-after Black Plates with Square Getter construction. A particularly interesting configuration among the first RCA productions of the 12AU7 family, appreciated for its build quality, robustness, and typical American sonic character.

The manufacturing code 6-09 identifies a production from Radio Corporation of America, Camden, New Jersey, made in the 9th week of 1956. The Black Plates / Square Getter combination, typical of RCA productions from the 1950s, makes this example particularly interesting from both a technical and collector's perspective.

The tube has been carefully tested in our laboratory using an Amplitrex AT-1000 Tube Tester, achieving a STRONG rating. The two sections measured Gm 1700 / Ia 8.6 mA and Gm 1800 / Ia 8.4 mA respectively, showing consistent and very well-aligned values. The balance is very good, with strong, regular, and stable emission.

It also passed a 48-hour Burn-in / Stability Test and was selected for Low Noise & Microphonics, with low and well-controlled noise. It is therefore suitable for even the most sensitive audio stages, as well as for hi-fi preamplifiers, input stages, drivers, and guitar amplifiers. The good matching between the two triodes also makes it suitable for use as a phase inverter in compatible hi-fi and instrumental applications. No shorts, gas, or anomalies were detected.

Sonically, vintage RCA Black Plates 12AU7s are particularly appreciated for a full-bodied, natural, and musical presentation, with rich and well-defined mids, solid and controlled bass, and smooth but detailed high frequencies. A balanced and engaging performance, ideal for those seeking the classic character of historical American RCA productions from the 1950s.

Ideal for hi-fi preamplifiers, integrated amplifiers, line stages, DACs and tube buffers, input and driver stages, phase inverters, and guitar amplifiers compatible with 12AU7 / ECC82.

The tube is Vintage, carefully tested, and fully functional. The aesthetic conditions are good, with partially eroded but still legible screen printing and a well-preserved tube body. It comes in our custom box for optimal protection.

A valuable RCA 12AU7 / ECC82 Black Plates Square Getter from 1956, truly tested and selected by Vacuum Tubes Treasures, with STRONG emission, Low Noise & Microphonics, and very well-balanced sections: an authentic vintage RCA example particularly interesting for quality audio applications.

Conditions:

  • Conditions: Vintage - Tested and functional - Supplied in our custom box for optimal protection. 
  • Functionality: Perfectly operational.
  • Aesthetic Conditions: Good – Partially eroded but still legible lettering. Tube body in good condition. See photos for details.
  • Manufacturing Code: 6-09 → RMA/EIA Open Date Code → manufactured the 9th week of 1956 → Radio Corporation of America, Camden, N. J.

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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
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