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SYLVANIA

12AU7A / ECC82 NOS Baldwin by SYLVANIA Matched Quad Long Gray Plates Halo Getter Tubes USA '60s

12AU7A / ECC82 NOS Baldwin by SYLVANIA Matched Quad Long Gray Plates Halo Getter Tubes USA '60s

£79.00 GBP
£79.00 GBP
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12AU7 / ECC82 NOS Baldwin by SYLVANIA Matched Quad Long Gray Plates Halo Getter AMPLITREX Tested Made in USA ’60

AMPLITREX Matched Quad – Low Noise & Microphonics – Vintage American SYLVANIA Production

Description

Matched Quad of 12AU7 / ECC82 NOS Baldwin by Sylvania, Made in USA 1960 production, selected for compatible hi-fi and musical applications where consistency between tubes, low noise, and operational stability are important elements.

Baldwin-branded tubes were intended for musical and professional applications, particularly quality electronic organs. In this case, the production can be attributed to Sylvania Electric Products Inc., with Long Gray Plates and Halo Getter construction.

The quad comes from the same manufacturing code 312 052, traceable to the 52nd week of 1960, a positive detail for manufacturing uniformity, aesthetic consistency, and collector value.

The tubes are in NOS – New Old Stock condition, with a clean internal structure, well-preserved lettering, and minimal signs of age. See photos for details.

Tested and selected using an Amplitrex AT-1000 Tube Tester as a Matched Quad, they achieved an overall VERY STRONG result, with Low Noise & Microphonics and 48h Burning Test passed. The consistency of values among the four tubes makes this quad particularly interesting for devices that use multiple 12AU7 / ECC82s in the same circuit.

Sonically, they offer a balanced, open, and natural reproduction, with controlled bass, clear and musical mids, clean highs, and a stable soundstage. The matching of the quad promotes tonal uniformity, consistency between circuit positions, and an orderly presentation.

Suitable for multi-stage tube preamplifiers, line stages, drivers, integrated amplifiers, DACs, tube buffers, vintage restorations, and circuits compatible with 12AU7 / ECC82. Also usable in compatible musical applications where low noise, stability, and natural harmonic response are required.

A truly selected, tested, and matched American NOS quad from Vacuum Tubes Treasures, ideal for those seeking vintage Sylvania production, electrical consistency, and reliable performance.

Test Results

Tubes tested on AMPLITREX AT-1000 Tube Tester

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

Tube #5

Section 1: Gm = 2200 ; Ia = 9.8 mA
Section 2: Gm = 2200 ; Ia = 9.4 mA

Tube #22

Section 1: Gm = 2100 ; Ia = 9.0 mA
Section 2: Gm = 2300 ; Ia = 10.2 mA

Tube #23

Section 1: Gm = 2300 ; Ia = 10.2 mA
Section 2: Gm = 2100 ; Ia = 8.8 mA

Tube #25

Section 1: Gm = 2200 ; Ia = 9.6 mA
Section 2: Gm = 2200 ; Ia = 9.2 mA

Additional Tests Performed

Burning Test: 48h – OK
Microphonics: Low. Tested and compliant for hi-fi use, including in phono stages and guitar amplifiers. Also suitable for V1.
Balance: The sections are consistent and well-aligned, making the tubes suitable for use as phase inverters in hi-fi and instrumental applications.
Emission Quality: Excellent – very strong and stable emission, without fluctuations.
Shorts and GAS: Absent.

Condition

Condition: NOS – New Old Stock – tested and functional. Supplied in our custom box for optimal protection.
Functionality: Perfectly operational.
Cosmetic condition: Excellent – lettering optimally preserved, minimal signs of age. See photos for details.

Manufacturing Code: 312 052 → 312 indicates the manufacturer, i.e., Sylvania Electric Products Inc., Emporium, Pa. - 052 → 0 indicates 1960, 52 indicates the 52nd week of the year.

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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
www.vtt.store | www.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.