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MAGNAVOX

6550 MAGNAVOX by TUNG-SOL Type 2 – 4th Generation - AMPLITREX Matched Quad - Made in USA

6550 MAGNAVOX by TUNG-SOL Type 2 – 4th Generation - AMPLITREX Matched Quad - Made in USA

8 956,00 SEK
0,00 SEK 8 956,00 SEK
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6550 MAGNAVOX by TUNG-SOL Type 2 - 4th Generation Gray Plates Triple Halo Getter Three Holes Matched Quad Tubes MADE IN USA

Description:

This matched quartet of 6550 MAGNAVOX by Tung-Sol , Made in USA, belongs to the Type 2 – 4th generation , one of the most mature and musically balanced versions of the historic American 6550.
The construction with gray plates , triple halo getter and three ventilation holes reflects a production phase oriented towards maximum electrical stability, controlled thermal dissipation and long operational reliability, maintaining intact the authoritative sound character typical of the best vintage 6550s.

The set was selected as Matched Quad and tested with professional equipment, it features the same manufacturing code on the entire quartet with homogeneous behavior and consistent response on all tubes.
This is a quartet designed for medium-high and high-end amplifiers, where balance, control and tonal solidity are fundamental requirements.

Sound Character

Bass
Deep, compact, and perfectly controlled. The low end is authoritative but never intrusive, with excellent articulation and the ability to sustain complex loads without losing definition.

Medium
Balanced, full, and natural. The vocals are solid and well-focused, with a rich yet composed harmonic texture. They perform excellently on jazz, classic rock, and orchestral repertoire.

High
Clean, extended, and uncluttered. The highs are present but never aggressive, with a balance that favors prolonged listening and delivers air and detail without fatiguing.

Dynamics
Convincing and stable. Transient response is prompt yet controlled, with a sense of always-available power reserves.

Soundstage
Wide and well-structured, with a solid and credible soundstage. Excellent separation of levels and stable imaging even at high volumes.

🎧 Use in Hi-Fi Amplifiers

Ideal for:

  • 6550 push-pull amplifiers
  • final and integrated courses in American schools
  • systems that require balance, control and reliability over time

An excellent choice for those who want the classic 6550 sound in a more modern and balanced version than the very first generations.

🎸 Use in Music Applications

Appreciated for:

  • high-powered bass and guitar amplifiers
  • professional applications where stability, headroom and predictable response are required

They offer a solid, defined and resistant sound even under demanding conditions of use.

🎯 Note for audiophiles and technicians

This Matched Quad of 6550 MAGNAVOX by Tung-Sol Type 2 – 4th Generation represents:

  • one of the most reliable and musically balanced versions of the 6550 USA
  • Robust construction with triple halo getters and gray plates
  • accurate matched selection
  • same manufacturing code
  • excellent compromise between sound performance, durability and collectible value

An ideal quartet for those looking for real performance, tonal coherence and the authentic character of the great American 6550s , without unnecessary compromises.

Test Results:

Tested on AMPLITREX AT-1000 Tube tester:
Test Conditions: Va = 450V ; Vg2 = 300V ; Vg = -30V
Measurements are taken after 10 minutes of preheating the tubes.
Average 100%: Gm = 6.50 ; Ia = 50 mA
TEST RESULT: All valves fall at least in the STRONG range, with two elements in the VERY STRONG area

Valve 1: Gm = 5.95 ; Ia = 48 mA
Valve 2: Gm = 5.91 ; Ia = 50 mA
Valve 3: Gm = 5.15 ; Ia = 44 mA
Valve 4: Gm = 5.32 ; Ia = 40 mA

Additional Tests Performed:

  • Microphonics: Standard. 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: Vintage tubes - Tested and in perfect working order. Shipped 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: 3227350 → 322 indicates the manufacturer, i.e. Tung-Sol Electric Inc., Newark 4, NJ - 73 → 1973 - 50 → 50th week of the year

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
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.