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SYLVANIA

12AX7 / ECC83 NOS Baldwin by SYLVANIA Long Gray Plates Halo Getter Tested Tube Made in USA '61

12AX7 / ECC83 NOS Baldwin by SYLVANIA Long Gray Plates Halo Getter Tested Tube Made in USA '61

₩128,000 KRW
₩128,000 KRW
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12AX7 / ECC83 NOS Baldwin by SYLVANIA Gray Plates Halo Getter Made in USA 1964

AMPLITREX Tested – Low Noise & Microphonics – Vintage American Sylvania Production

General Description

This 12AX7 / ECC83 Baldwin by Sylvania, produced in the USA in 1964, represents one of the most appreciated American interpretations of the renowned ECC83.

Tubes branded Baldwin were intended for high-end electronic organs of the era and were selected by manufacturers who required reliability, low noise, and long operational life. Behind the Baldwin brand, in this case, we find the renowned SYLVANIA Made in USA production, recognizable by its construction with Gray Plates and Halo Getter, a configuration particularly appreciated by enthusiasts for its tonal balance and natural musicality.

Sylvania Gray Plates from the early 1960s are known for their ability to combine detail, openness, and naturalness, offering an engaging yet never artificial reproduction.

This tube has been carefully verified using AMPLITREX AT-1000, resulting in VERY STRONG performance, exceeding nominal reference values.

From an aesthetic point of view, it is in excellent condition, with a well-preserved internal structure and legible silkscreening.

Sound Characteristics

Baldwin by Sylvania Gray Plates possess the typical high-quality American sound character, characterized by balance, musicality, and excellent intelligibility.

Bass

The bass is well-controlled and defined, with good presence and articulation. It provides solidity to the low end without making the musical message heavy.

Mids

The mid-range is probably the strong point of this production. Vocals appear natural, rich in harmonics, and well-focused in the soundstage.

Treble

The treble is open and detailed but never aggressive. Environmental information and finer nuances are reproduced with naturalness and fluidity.

Dynamics

The dynamics are prompt and lively, with an engaging musical response that enhances both small ensembles and large orchestras.

Soundstage

The soundstage is wide and well-organized, with good depth and correct instrument placement.

🎧 Use in Hi-Fi Amplifiers

This tube is particularly suitable for:

  • Tube preamplifiers
  • Integrated hi-fi amplifiers
  • MM and MC phono stages
  • Tube DACs
  • Buffers and line stages
  • Restorations of vintage American electronics

The Low Noise & Microphonics selection also makes it suitable for the most sensitive positions in the circuit.

🎸 Use in Musical Applications

Baldwin by Sylvania Gray Plates are also highly appreciated by musicians due to their ability to offer:

  • Excellent note definition
  • Rich and musical mids
  • Natural dynamic response
  • Open but not aggressive sound

Particularly interesting for guitar amplifiers that require clarity, articulation, and vintage American musicality.

🎯 Note for audiophiles and collectors

Authentic Sylvania Gray Plates from the early 1960s, especially when available with the Baldwin brand and in such well-preserved condition, represent a very interesting choice for those who desire the classic vintage American sound.

The combination of:

  • SYLVANIA Made in USA production
  • Gray Plates
  • Halo Getter
  • Low Noise & Microphonics
  • VERY STRONG performance

makes this tube ideal for both quality hi-fi listening and for collectors and enthusiasts of American tube electronics.

Test Results:

Tube tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -2V
  • Average 100%: Gm = 1600 ; Ia = 1.2 mA
  • Test Result: VERY STRONG

Tube #5:

  • Section 1: Gm = 1400 ; Ia = 1.2 mA
  • Section 2: Gm = 1600 ; Ia = 1.2 mA
Additional Tests performed:
  • Microphonics: Low. Tested and suitable for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.
  • Balance: Very good. The sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Short Circuits and GAS: Absent.

Condition:

  • Condition: NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.  
  • Functionality: Perfectly operational.
  • Cosmetic Condition: Excellent – Markings very well preserved, minimal signs of age. See photos for details.
  • Manufacturing Code: 312 139 → 312 indicates the manufacturer, Sylvania Electric Products Inc., Emporium, Pa. - 139 → 1 ( three digits ) → 1961 - 39 → 39th week of the year

Discover why our tubes 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.