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RCA

5963 ( 12AU7 ) RCA Matched Pair Long Black Plates Foil Getter AMPLITREX Tested

5963 ( 12AU7 ) RCA Matched Pair Long Black Plates Foil Getter AMPLITREX Tested

€82,45 EUR
€82,45 EUR
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5963 (12AU7 / ECC82) RCA – Matched Pair – Black Plates – Foil Getter

AMPLITREX Tested – Made in USA – 1956

Description:

This matched pair of RCA 5963 (12AU7 / ECC82), Made in USA 1956 , belongs to one of the most fascinating and musical productions of RCA of the 1950s. The construction with black plates and foil getters is typical of the superior quality series, created for professional applications and today sought after for their warm, authoritative and incredibly refined sonic character.

The valves are AMPLITREX Tested and carefully selected as a Matched Pair : the overall behavior is coherent, stable and silent, with a performance that immediately conveys the feeling of a “special”, uncommon component.

  • Bass: Compact, controlled, and well-articulated. The low end is tidy and precise, with a dry feel that promotes clarity and rhythm.
  • Mids: Balanced and natural. Vocals are credible and well-focused, with a harmonic texture that's typical of RCA: solid, musical, and free from excessive coloration.
  • Highs: Clean and well-integrated. The highs are smooth and controlled, without harshness, with consistent detail that never becomes fatiguing.
  • Dynamics: Smooth and fluid. The response is prompt but composed, with predictable and stable behavior, ideal for line stages and drivers.
  • Soundstage: Stable and well-organized soundstage. Good separation of sound planes and correct imaging, with an orderly and realistic presentation.

🎧 Use in Hi-Fi Stereo Amplifiers

Ideal for:

  • preamplifiers and line stages in non-critical positions
  • drivers and buffers
  • Vintage and modern hi-fi amplifiers compatible with 12AU7 / 5963

Particularly suitable for non-critical or moderate gain positions, where operational stability, low overall noise and timbral coherence are required.

🎸 Use in Musical Instrument Amplifiers

Suitable for:

  • Guitar and bass amplifiers in driver, phase inverter or V2/V3 positions
  • applications where operational stability, good control and low background noise are required
  • use in studios or in professional settings where low overall noise is an important requirement

It offers reliable, controlled operation, with low noise and predictable response.
It is recommended to avoid using them in the most sensitive or very high-gain positions; however, they are perfectly suited to less critical stages, where they can offer reliable and consistent operation.

🎯 Note for audiophiles and technicians

A solid and coherent pair, designed for those looking for reliability, musicality and the classic RCA character of the 50s, without compromising on operational stability.

Test Results:

Valve tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -8.5V
  • Average 100%: Gm = 2200 ; Ia = 10.5 mA
  • Test Result: VERY STRONG
Valve #5:
  • Section 1: Gm = 2300 ; Ia = 12.2 mA
  • Section 2: Gm = 2100 ; Ia = 11.2 mA
Valve #2:
  • Section 1: Gm = 2360 ; Ia = 11.6 mA
  • Section 2: Gm = 2100 ; Ia = 10.2 mA
Additional Tests Performed:
  • Microphonics: Standard. Tested and approved for use in hi-fi and guitar amplifiers. Recommended for use in V2, V3, V4, as a driver, or in less critical stages. Not recommended in V1 or in very high-gain positions that are particularly sensitive to microphonics.
  • Balance: The sections present a coherent overall balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between the sections is not required.
  • Output Quality: Excellent – Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Condition: Vintage - Tested and working - Comes in our custom box for optimal protection.
  • Functionality: Fully functional.
  • Cosmetic condition: Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.

Manufacturing Code:

  • 56-39 → RMA/EIA Open Date Code → manufactured week 39 of 1956

Find out why our valves are different →

Condizioni di vendita e sicurezza

Anti-Tamper Security Seal Policy:
Each product is sealed to guarantee quality and integrity.
The right of withdrawal is subject to the seal remaining intact, as provided for by the Consumer Code.

Eco-Friendly Packaging:
The tube will be shipped with protective packaging to ensure safety during transport.
We use recycled and recyclable paper for packaging, along with brown ECO-KRAFT adhesive tape, eco-friendly and solvent-free.

Important Notes:
This tube, manufactured according to the standards of its era, is designed to operate in equipment compatible with vintage tubes.
It is recommended to follow standard safety guidelines to avoid malfunctions or damage.

Safety Assurance:
Although not tested according to modern GPSR regulations, this tube was designed to operate safely under the conditions for which it was manufactured.
We recommend using it only with equipment that supports vintage tubes, in order to avoid risks of malfunction or damage.
Technical data note:
In some cases, the technical data provided may be based on datasheets from other manufacturers or on equivalent historical specifications, when a specific official datasheet for the production batch of the listed item is not available.
Electrical characteristics may vary slightly depending on the production batch and manufacturing period, as is typical for thermionic components.

Safety Information:
Warning: Keep out of reach of children.
To be used under adult supervision.
Use the product only with equipment designed for vintage tubes.

Shipping & Returns

Shipping & Returns

Shipping Costs

Shipping costs vary depending on the total amount of the items in the cart and are calculated automatically during the checkout process.
All shipments are fully insured. The courier is automatically selected based on destination, weight, and shipment characteristics.

Shipping Times and Delivery

The indicated delivery times are purely indicative.
Any delays, storage issues, or operational changes made by the carrier (for example during peak periods such as holidays) are not attributable to Vacuum Tubes Treasures.

In such cases, we will nevertheless provide the Customer with all necessary support to open claims or assistance requests with the appointed courier.

International Shipping (Non-EU Countries)

For orders shipped to countries outside the European Union, any customs duties, import taxes, or additional charges are the sole responsibility of the recipient.
Vacuum Tubes Treasures has no control over these costs, which may vary from country to country. Customers are therefore advised to contact their local customs authorities prior to placing an order.

Warranty

All products sold by Vacuum Tubes Treasures are covered by the legal warranty of conformity, in accordance with Italian Legislative Decree No. 206/2005 (Consumer Code) and the Italian Civil Code (Articles 1490 et seq.), under the conditions set out below.

Warranty for Vacuum Tubes

Vacuum tubes, being components subject to wear and of vintage or specialized nature, are covered by a specific warranty of 6 (six) months from the date of delivery.
The warranty covers exclusively proven manufacturing or conformity defects that arise during proper use in accordance with technical specifications.

The warranty does not cover:

  • normal wear and tear,
  • subjective sound preferences,
  • use in incompatible equipment,
  • tampering or improper use.

Right of Withdrawal

Purchases made on the Vacuum Tubes Treasures website are governed by Italian regulations on distance contracts (Legislative Decree No. 206/2005).

Consumers have the right to withdraw from the contract within 14 (fourteen) days from the date of receipt of the goods, without providing any reason.

Conditions for Exercising the Right of Withdrawal

The right of withdrawal may be exercised only if:

  • the product has not been used,
  • the product is returned in its original condition,
  • the tamper-evident security seal is intact and not broken.

📌 Returns are not accepted for reasons related to sound preference, tube rolling, or subjective audio evaluation.
As with a music recording, a vacuum tube cannot be returned simply because its sound does not match personal taste.

Effects of Withdrawal

In the event of a valid withdrawal:

  • all payments received, including standard shipping costs, will be refunded,
  • refunds will be issued within 14 days from receipt of the returned goods,
  • the refund may be withheld until the goods have been received and inspected.

Refunds will be made using the same payment method used for the original transaction, unless otherwise agreed.

Return Shipping Costs

Return shipping costs are borne by the Customer, except in cases of:

  • verified defective products,
  • errors attributable to Vacuum Tubes Treasures.

In such cases, return shipping costs will be fully covered by us.

Damaged or Incorrect Items

If the Customer receives a damaged or incorrect item, it must be reported within 5 (five) working days from delivery, by email or telephone, clearly stating the issue.

Uncollected Parcels, Storage, and International Shipments

It is the Customer’s responsibility to monitor the shipment and promptly arrange for collection or customs clearance.
Any costs, delays, or losses resulting from:

  • failure to collect the parcel,
  • prolonged storage,
  • abandonment of the parcel at customs,

do not entitle the Customer to any refund.

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.