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RCA

6SN7GTA RCA Radiotron Matched Pair Black Plates Double D Side Getter AMPLITREX Tested USA 50s

6SN7GTA RCA Radiotron Matched Pair Black Plates Double D Side Getter AMPLITREX Tested USA 50s

€119,90 EUR
€119,90 EUR
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6SN7GTA RCA Radiotron Matched Pair Black Plates Double D Side 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 = 2300 ; Ia = 7.6 mA
  • Section 2: Gm = 2400 ; Ia = 9.0 mA

Tube #2

  • Section 1: Gm = 2370 ; Ia = 7.2 mA
  • Section 2: Gm = 2500 ; Ia = 9.6 mA

Additional tests:

  • Burn-in / Stability Test: 48h – OK
  • Microphonics and noise: Low. Tested and compliant for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.
  • Balance: The sections are not perfectly aligned. The tube is indicated for use in hi-fi in non-critical stages (input or driver) and in guitar amplifiers. Not indicated as a phase inverter or in applications that require strict balance between the sections.
  • Emission: Excellent – Very strong and stable emission, without fluctuations.
  • Short circuits / Gas: absent

Description

Captivating vintage pair of 6SN7GTA RCA Radiotron, produced in the United States in the 1950s and carefully selected as a Matched Pair. Both specimens share the characteristic Black Plates with Double D Side Getter construction, a distinctive configuration of the historic American RCA production. The black plates, the particular arrangement of the side getters and the common internal architecture give the pair a homogeneous construction identity, particularly appreciated by connoisseurs of vintage American tubes.

The measurements performed with the Amplitrex AT-1000 highlight a good electrical uniformity between the two specimens. The transconductance of the four sections is between 2300 and 2500 µmhos, with averages of 2350 and 2435 µmhos respectively, compared to the nominal reference of 2600. The anode currents vary from 7.2 to 9.6 mA, with particularly close averages of 8.3 and 8.4 mA, compared to the reference of 9.0 mA. The overall matching is consistent, although presenting differences in the internal balance of the individual tubes, to be considered in applications that require strict symmetry between the sections.

Both tubes have been subjected to careful instrumental checks that confirmed very strong and stable emission, without fluctuations, short circuits or presence of gas. The checks also highlighted low noise and microphonics levels, characteristics that are particularly important for use in vintage and compatible modern audio equipment.

The 6SN7GTA RCA Black Plates find application in hi-fi preamplifiers, headphone amplifiers and driver stages, especially in circuits that do not require strict symmetry between the sections. The RCA production of the 1950s is traditionally appreciated by audiophiles for a musical presentation generally described as full-bodied, natural and rich in nuances, with an expressive midrange and a pleasant listening fluidity.

The value of this pair lies in the authenticity of the RCA Black Plates with Double D Side Getter construction and in the documented electrical selection. The code 4-35 / 274 identifies a specimen produced in the 35th week of 1954, while the other, lacking a readable code, presents corresponding construction characteristics, attributable to the same era. The worn screen printing and signs of use testify to their history, without compromising their verified functionality. Two authentic vintage RCA Radiotrons, carefully tested and matched, for enthusiasts who wish to rediscover the charm of original American thermionic production.

Conditions

  • Conditions: Vintage Tubes - Tested and perfectly functioning. Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational
  • Aesthetic conditions: One tube in sufficient condition, with completely absent screen printing and evident signs of use, the other in Good condition – Partially eroded lettering, but manufacturing code still readable. Tube body in good condition. See photos for details.

Manufacturing codes: 

  • 4-35 274 → RMA/EIA Open Date Code → manufactured in the 35th week of 1954 - 274 → Radio Corporation of America, Camden, N. J.
  • Code absent. Production attributable approximately to the 1950s based on construction characteristics.

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.

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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.

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