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RCA

6SN7GT RCA Radiotron Matched Pair Silver Logo Black Plates D Getter AMPLITREX Tested Low Noise & Mic Tubes

6SN7GT RCA Radiotron Matched Pair Silver Logo Black Plates D Getter AMPLITREX Tested Low Noise & Mic Tubes

HK$1,071.00 HKD
HK$1,071.00 HKD
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6SN7GT RCA Radiotron Matched Pair Silver Logo Black Plates D Getter -  Made In USA - 1950s

AMPLITREX Tested – VERY STRONG – Low Noise & Microphonics – Vintage American RCA Production

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 = 2500 ; Ia = 8.2 mA
  • Section 2: Gm = 2500 ; Ia = 7.8 mA

Tube #2

  • Section 1: Gm = 2600 ; Ia = 7.6 mA
  • Section 2: Gm = 2300 ; Ia = 8.0 mA

Description

Interesting vintage pair of 6SN7GT RCA Radiotron, produced in the United States in the 1950s and carefully selected as a Matched Pair. Both specimens feature the characteristic Black Plates with D Getter construction, a configuration particularly appreciated in American RCA production. The famous silver RCA Radiotron screen printing, still clearly visible on one of the specimens, recalls the charm of the original tubes from this period. The manufacturing markings date the pair to 1954, with a completely legible date on one tube and partially preserved on the other.

The measurements performed with the Amplitrex AT-1000 confirm overall well-matched electrical characteristics. The transconductance of the four sections ranges between 2300 and 2600 µmhos, with averages of 2500 and 2450 µmhos for the respective tubes, close to the nominal reference of 2600. The anode currents range from 7.6 to 8.2 mA, with averages of 8.0 and 7.8 mA, compared to the reference of 9.0 mA. Although there are some differences between the individual sections, the pair shows a good overall match, particularly evident in the closeness of the average anode currents.

Both tubes have been carefully checked for emission stability, noise, and microphonics, with results confirming strong and stable emission, low noise levels, and no shorts or gas. Important checks to assess the actual condition of used vintage tubes and select reliable specimens for even sensitive audio applications.

The 6SN7GT RCA Black Plates find use in hi-fi preamplifiers, headphone amplifiers, driver stages, and compatible phase inverter circuits. This American production is traditionally appreciated by audiophiles for a musical presentation generally described as full-bodied, natural, and rich in nuances, with an expressive midrange and balanced reproduction, characteristics that continue to fuel interest in tube listening.

The charm of this pair lies in its historical authenticity and 1950s RCA construction, accompanied by documented electrical characteristics. The different conditions of the screen printing and signs of use testify to the history of these specimens, without compromising their verified functionality. A carefully selected vintage RCA Radiotron pair, interesting for enthusiasts who wish to rediscover original American production through tested tubes ready for new use.

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 a consistent balance, fully compatible with 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 perfectly functional. Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational
  • Aesthetic condition: One tube in sufficient condition, with the screen printing almost completely absent and obvious signs of use, the other in Good condition – Partially eroded lettering, but still legible. Tube body in good condition. See photos for details.
  • Manufacturing codes: 

4-0? 274 → RMA/EIA Open Date Code → manufactured in the ??th week of 1954 - 274 → Radio Corporation of America, Camden, N. J.

4-09 → RMA/EIA Open Date Code → manufactured in the 9th week of 1954 - by 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
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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.