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RCA

12X4 RCA NOS NIB Matched Pair Black Plates Foil Getter Tubes Rectifiers Made in USA '58

12X4 RCA NOS NIB Matched Pair Black Plates Foil Getter Tubes Rectifiers Made in USA '58

€89,90 EUR
€89,90 EUR
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12X4 RCA NOS NIB Matched Pair Black Plates Foil Getter Tubes Rectifiers Made in USA '58

Description:

The 12X4 RCAs with black plates and foil getters , produced in 1958 in the United States, represent one of the most refined and sought-after versions of this miniature rectifier. Offered in NOS NIB (New Old Stock, New In Box) condition and as a matched pair , they offer not only the historic RCA build quality but also the guarantee of an ideal match for valuable restorations and high-end hi-fi applications. The foil getter makes them particularly attractive to collectors, adding a rare and distinctive detail to an already valuable set.

Sound characteristics

  • Bass : dry and well-defined, with a rigorous hold that keeps the low register tidy and precise.
  • Mids : linear and natural, transparent and faithful to the source, with a neutral timbre that does not color the signal.
  • Highs : Clear and crystalline, with a touch of controlled brilliance that maintains balance and cleanliness.
  • Dynamic : stable and regular, capable of providing continuity of power even under variable conditions.
  • Soundstage : neutral and quiet, with a clean sound base that allows the qualities of the active tubes to emerge to the fullest.

🎧 Use in Hi-Fi Stereo
Perfect for small preamps, tuners, and vintage stereo systems from the 1950s and 1960s, these matched RCA rectifiers offer quiet operation, stability, and tonal consistency while preserving the authenticity of the original design.

🎸 Use in Music Amplifiers
Also popular in vintage electronic instruments and amplifiers, the 12X4 RCAs ensure a smooth and even power supply, contributing to a faithful, stable sound free from unwanted compression.

🎯 Note for audiophiles and technicians
This matched pair with foil getters and black plates , dating from 1958, is a rare and highly desirable set. RCAs from this period are universally recognized for their robustness, quiet operation, and neutral sound quality: a real opportunity for collectors, restorers, and enthusiasts seeking the true "American voice" of the golden years.

Test Results:

Valve tested on Funke W19 Tube Tester:

  • Test Conditions: Va = 60V, Vf = 6.3V
  • Average 100%: Ia = 42 mA
  • Test Result: VERY STRONG

Valve 1:

  • Section 1: Ia = 47 mA
  • Section 2: Ia = 47 mA

Valve 2:

  • Section 1: Ia = 46 mA
  • Section 2: Ia = 45 mA
Additional Tests Performed:
  • Microphonics: Very Low. Tested and approved for use in hi-fi and guitar amplifiers.
  • Output Quality: Excellent – Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Condition: NOS - NIB - New Old Stock, New In Box - Tested and working - Supplied in original box.
  • Functionality: Fully functional.
  • Aesthetic condition: Very good – Clearly legible writing with minor signs of wear, no obvious defects. See photos for details.
  • Manufacturing Code: KS → two-letter code → production January 1958

Find out why our valves 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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📧 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.