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RCA

12BH7A RCA NOS NIB Black Plates Dimpled D-Foil Getter USA 1950s AMPLITREX Tested

12BH7A RCA NOS NIB Black Plates Dimpled D-Foil Getter USA 1950s AMPLITREX Tested

2.214,00 CZK
2.214,00 CZK
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12BH7A RCA NOS NIB Black Plates Dimpled D-Foil 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 = -10.5V
Average 100%: Gm = 3.10 ; Ia = 11.5 mA
Test Result: VERY STRONG

Tube:
  • Section 1: Gm = 3.70 ; Ia = 15.6 mA
  • Section 2: Gm = 3.30 ; Ia = 11.8 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.
  • Balance: The sections are not perfectly aligned. The tube is suitable for use in hi-fi systems in non-critical stages (input or driver) and in guitar amplifiers. Not recommended as a phase inverter or in applications requiring strict balance between sections.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Description:

Precious 12BH7A RCA NOS NIB, vintage American production attributable to the 1950s, featuring the sought-after Black Plates with Dimpled D-Foil Getter construction, a particularly interesting configuration of the first RCA productions of the 12BH7 family.

The combination of the classic RCA Black Plates with the distinctive dimpled D-Foil Getter makes this example particularly attractive for vintage American production enthusiasts and for those seeking a period 12BH7A in authentic NOS NIB – New Old Stock, New In Box condition.

The tube underwent 48 hours of burn-in / stability test and was subsequently carefully tested in our laboratory using the Amplitrex AT-1000 Tube Tester, achieving a VERY STRONG classification. Both sections show transconductance values higher than the nominal reference, with Gm 3700 and 3300 compared to a 100% value of 3100, confirming particularly vigorous and stable emission. The tube was also found to be Low Noise & Microphonics, with no shorts, gas, or detected anomalies.

The sections do not have a sufficiently strict balance for applications requiring perfect symmetry. The tube is therefore particularly suitable for driver stages, line stages, and other non-critical audio positions, as well as for guitar amplifiers, while it is not the ideal choice as a phase inverter when a strict balance between sections is required.

Sonically, American RCA Black Plates from this period are appreciated for rich, authoritative, and musical reproduction, with solid and well-structured bass, a full and natural midrange, and clean and refined high frequencies. The overall character combines the typical musicality of the best vintage RCA productions with the dynamics and driving capability characteristic of the 12BH7A.

The tube is NOS NIB – New Old Stock, New In Box, carefully tested and fully functional, supplied in its original RCA box. The aesthetic conditions are good, with partially eroded but still legible silk-screening and a well-preserved tube body.

A fascinating and uncommon RCA 12BH7A Black Plates Dimpled D-Foil Getter Made in USA, genuinely tested and selected by Vacuum Tubes Treasures, ideal for those seeking authentic 1950s American RCA production, NOS, very strong, and selected Low Noise & Microphonics.

Condition

  • Condition: NOS - NIB - New Old Stock, New In Box - Tested and working - Supplied in Original box.
  • Functionality: Fully operational.
  • Cosmetic condition: Good – Partially eroded inscriptions, but still legible. Tube body in good condition. See photos for details.
  • Manufacturing Code: Code not decipherable. Production tentatively attributable to the 1950s based on construction characteristics.

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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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  • 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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