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SYLVANIA

71A SYLVANIA NOS Matched Pair Silver Plates Hanging Filaments Foil Getter USA – Same Date Codes

71A SYLVANIA NOS Matched Pair Silver Plates Hanging Filaments Foil Getter USA – Same Date Codes

2 229,00 SEK
2 229,00 SEK
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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

Matched pair of 71A Sylvania NOS – Made in USA, selected for vintage amplifiers, period restorations, and low-power single-ended projects based on small directly heated triodes.

The 71A is a DHT – Directly Heated Triode, belonging to the great American tradition of early audio amplification. It is a tube increasingly sought after today for its intimate, natural, and highly musical sonic character, particularly appreciated in simple and refined circuitry.

This pair features a construction of great historical charm: ST glass, silver plates, foil dimpled getter, hanging filaments, and a black 4-pin base. Both tubes have the same 4V code, a positive detail for selection consistency. Production is likely attributable to the 1940s, prudently indicated as likely 1940s production.

The aesthetic conditions are excellent, showroom quality. The only note concerns the 71A marking on the glass of one of the two tubes, which is less visible/partially faded. The tubes are not supplied with original boxes. See photos for details.

The pair has been tested on Amplitrex AT-1000 with a VERY STRONG result and has been selected as Low Noise & Microphonics. The measured values are consistent with Sylvania operational data at the typical point Va = 135V, Ia approximately 17.3 mA, Mutual Conductance approximately 1650 µmhos, confirming the excellent electrical condition of the pair.

From a sonic perspective, the 71A Sylvania offers an intimate, fluid, and natural performance, with open and communicative mids, delicate and well-integrated highs, and dry and controlled bass. Its strength lies in microdynamics: nuances, presence, and timbral naturalness emerge with great vintage charm.

Suitable for low-power single-ended amplifiers, philological restorations, vintage equipment, and compatible DHT projects, where tube quality, electrical consistency, and quietness are essential elements.

A rare and fascinating 71A Sylvania NOS pair, truly selected, tested, and matched by Vacuum Tubes Treasures: not just vintage tubes, but a historical, strong DHT selection ready for refined applications.

Test Results:

Tube tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 135V ; Vg = -27V 
  • Measurements taken after 3 minutes of warm-up.
  • Average 100%: 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 compliant for hi-fi use, including phono stages and guitar amplifiers.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Conditions:

  • 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 excellently preserved, minimal signs of age. The only cosmetic note concerns the 71A marking 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 production of that era. Both tubes bear the same "4V" code, a detail that reinforces the historical, aesthetic, and constructive coherence of the pair.

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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
www.vtt.store | www.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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