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SYLVANIA

71A SYLVANIA NOS Matched Pair Silver Plates Hanging Filaments Foil Getter USA – Same Data Codes 4V – VERY STRONG

71A SYLVANIA NOS Matched Pair Silver Plates Hanging Filaments Foil Getter USA – Same Data Codes 4V – VERY STRONG

€199,00 EUR
€199,00 EUR
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71A SYLVANIA NOS Matched Pair Silver Plates Hanging Filaments Foil Dimpled Getter Made in USA – Same Data Codes 4V

AMPLITREX Tested – VERY STRONG – Low Noise & Microphonics

General Description

This pair of 71A Sylvania NOS – Made in USA represents a selection of great historical and collector's appeal, dedicated to vintage amplification enthusiasts, period restorations, and low-power single-ended projects.

The 71A is a small DHT – Directly Heated Triode, a direct-heated tube belonging to the great American tradition of early audio amplifications. It is a type that is increasingly sought after today for its immediate, natural, and intimately musical sonic character, particularly appreciated in simple and refined circuits, where the quality of the tube plays a central role in the final output.

This pair features a construction of remarkable elegance and strong historical appeal: ST glass, silver plates, foil dimpled getter, hanging filaments, and black 4-pin base. The hanging filament structure is a particularly interesting detail in small direct-heated triodes, as it recalls a carefully crafted and visually very scenic period construction. Both tubes bear the same 4V code, a detail that reinforces the consistency of the selection. Production is likely attributable to the 1940s, cautiously indicated as likely 1940s production.

The aesthetic conditions are excellent, museum-quality, with a very well-maintained general presentation. The only aesthetic note concerns the 71A branding on the glass of one of the two tubes, which is less visible/partially faded. The tubes are not supplied with original boxes.

Sonic Characteristics

The 71A Sylvania offers a sonic signature typical of small direct-heated triodes: intimate, fluid, natural, and rich in micro-information. It is not a tube designed for high power, but for those seeking tonal refinement, expressive immediacy, and a listening experience with a strong vintage flavor.

Bass
The bass is dry, controlled, and well-articulated, more oriented towards precision and naturalness than impact force. In well-designed single-ended circuits, they contribute to a clean and coherent sound foundation.

Mids
The mid-range is the heart of the 71A: open, direct, and very communicative. Vocals, acoustic instruments, and small ensembles are reproduced with great naturalness, with a refined harmonic texture and a very pleasant presence.

Highs
The highs are delicate, airy, and well-integrated. The high range maintains brightness and detail without becoming aggressive, contributing to an elegant and non-fatiguing reproduction.

Dynamics
Dynamics are fast and sensitive to small musical variations. The 71A excels in microdynamics, transient response, and the ability to reproduce subtle nuances with great naturalness.

Soundstage
The soundstage is focused, precise, and very credible. In high-efficiency systems, it can offer a refined three-dimensional image, with good separation between instruments and a remarkable sense of presence.

🎧 Use in Hi-Fi Amplifiers

This pair is particularly interesting for vintage amplifications, philological restorations, and low-power single-ended projects based on DHT tubes. The 71A is an ideal choice for those seeking an essential, transparent, and strongly linked to the tradition of early audio amplifications.

The selection as a Matched Pair, combined with the VERY STRONG result and the Low Noise & Microphonics behavior, makes this pair suitable for quality applications in compatible circuits, where electrical coherence and quietness are important elements.

🎸 Use in Musical Applications

In compatible musical and experimental applications, the 71A can offer a very personal character: fluid response, natural compression, and a particularly fascinating vintage harmonic texture. It is a tube indicated for those seeking an authentic, unconventional sonic voice strongly linked to the history of tube amplification.

🎯 Note for Audiophiles and Technicians

The Sylvania datasheet indicates, at the typical point with Va = 135V, approximately Ia = 17.3 mA and Mutual Conductance = 1650 µmhos, equivalent to about 1.65 mA/V. The values measured on Amplitrex are therefore fully consistent with the original Sylvania operating data, confirming the excellent electrical condition of the pair.

A high-level, rare, and fascinating pair of 71A Sylvania NOS, designed for those who desire a true vintage American selection: not just simple vintage tubes, but a historical, coherent, strong DHT pair ready for refined applications in the full style of Vacuum Tubes Treasures.

Test Results:

Tube tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 135V ; Vg = -27V 
  • Measurements taken after 3 minutes warm-up.
  • 100% Average: Gm = 1.5 ; Ia = 17.5 mA
  • Test Result: VERY STRONG

Tube 1: Gm = 1.6 ; Ia = 14.6 mA

Tube 2: Gm = 1.7 ; Ia = 18.2 mA

Additional Tests Performed:
  • Microphonics: Low. Tested and suitable for hi-fi use, including in phono stages and guitar amplifiers.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Condition:

  • Condition: NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection. 
  • Functionality: Perfectly operational, with excellent test results.
  • Cosmetic condition: Excellent – Markings very well preserved, minimal signs of age. The only aesthetic note concerns the 71A branding on the glass of one of the two tubes, which is less visible/partially faded. See photos for details.
  • Manufacturing code: 4V - Made in the USA - The construction suggests probable 1940s / early post-war production, with ST glass structure, black 4-pin base, silver plates, foil dimpled getter, and hanging filaments, characteristics consistent with Sylvania's American productions of that era. Both tubes bear the same "4V" code, an element that reinforces the historical, aesthetic, and constructive coherence of the pair.

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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.

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