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6SN7 GTB RCA Red Logo AMPLITREX Matched Pair Black Plates D Getter Low Noise & Mic Tubes

6SN7 GTB RCA Red Logo AMPLITREX Matched Pair Black Plates D Getter Low Noise & Mic Tubes

Regular price $198.00 CAD
Regular price Sale price $198.00 CAD
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6SN7 GTB RCA Red Logo AMPLITREX Matched Pair Black Plates D Getter - Made In USA - 1960s

AMPLITREX Tested – VERY STRONG – Low Noise & Microphonics

Test Results:

Tubes tested on Amplitrex AT-1000 Tube tester:

  • Test Conditions: Va = 250V, Vg = -8V
  • Average 100% Gm = 2600 ; Ia = 9.0 mA
  • Test Result: VERY STRONG

Tube #1

  • Section 1: Gm = 2400 ; Ia = 9.2 mA
  • Section 2: Gm = 2500 ; Ia = 10.0 mA

Tube #2

  • Section 1: Gm = 2400 ; Ia = 8.8 mA
  • Section 2: Gm = 2500 ; Ia = 9.4 mA

Description

A prized matched pair of 6SN7GTB RCA Red Logo, manufactured in the USA in the mid-1960s, featuring the sought-after Black Plates with D Getter construction. Both tubes belong to the same RCA production run and represent a configuration that is increasingly appealing to those seeking authentic vintage American 6SN7s selected for audio use.

RCA's construction with Black Plates and D Getter is particularly valued for its robustness, reliability, and sonic consistency. Tubes from this period retain many of the construction characteristics of earlier RCA productions, combined with the greater uniformity typical of 1960s manufacturing.

The pair has been carefully tested and selected in our laboratory using the Amplitrex AT-1000 Tube Tester, achieving a VERY STRONG classification. Both tubes were found to have Low Noise & Microphonics and exhibit excellent electrical alignment, with transconductance values perfectly matching between the two samples and well-balanced internal sections.

Sonically, RCA Black Plate tubes are known for full, natural, and authoritative reproduction, with solid and controlled bass, a rich and musical midrange, soft yet well-defined treble, and a broad and stable soundstage. The overall character is balanced, dynamic, and refined, with the typical warmth of the best American RCA productions.

Ideal for hi-fi preamplifiers, driver stages, phase splitters, headphone amplifiers, and all equipment compatible with 6SN7GT / 6SN7GTB that requires a high-quality matched pair.

The tubes are used, carefully tested, and fully functional. Aesthetic conditions are good, with partially faded but still legible logos and the tube body in good overall condition.

A prized matched pair of authentic RCA 6SN7GTB Red Logo Black Plates, genuinely tested and selected by Vacuum Tubes Treasures, ideal for those seeking manufacturing quality, musicality, and reliability in vintage American production.


Additional Tests:

  • Microphonics and Noise: Low. Tested and suitable for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.
  • Balance: Good. The sections show consistent balance, fully compatible for use in hi-fi and musical amplifiers, in all applications where absolute symmetry between sections is not required.
  • Emission: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts / Gas: absent

Condition

  • Condition: Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.
  • Functionality: Fully operational
  • Aesthetic Condition: Good – Labels partially faded, but still legible. Tube body in good condition. See photos for details.

Manufacturing Code:

  • AV → two-letter code → November 1965 production → Radio Corporation of America, Camden, N. J.
  • BG → two-letter code → October 1966 production → Radio Corporation of America, Camden, N. J.

Discover 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.

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.