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AMPEREX

6CA7 / EL34 Amperex by MULLARD Blackburn XF3 – NOS NIB Halo Getter - Two Matched Pairs - Made in Great Britain

6CA7 / EL34 Amperex by MULLARD Blackburn XF3 – NOS NIB Halo Getter - Two Matched Pairs - Made in Great Britain

€1.390,00 EUR
€1.390,00 EUR
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6CA7 / EL34 Mullard XF3 – Amperex Label – Two Matched Pairs – NOS NIB – Halo Getter – Made in Great Britain

AMPLITREX Tested – TWO HIGH-GRADE MATCHED PAIRS – VERY STRONG – Original Amperex Boxes

Description

Set consisting of four 6CA7 / EL34 Mullard XF3 NOS NIB, Amperex branded and produced in the historic Mullard factory in Blackburn, Great Britain, carefully selected as two distinct high-grade matched pairs.

This is not a single matched quartet of four tubes, but two electrically coherent pairs, each selected for anode current and transconductance. This configuration is particularly interesting for dual mono amplifiers, mono power amplifiers, systems using two separate pairs, or for those who wish to have a second perfectly selected Mullard XF3 pair.

The tubes are in NOS NIB – New Old Stock, New In Box condition, supplied in their original Amperex boxes. The construction features a Halo Getter and the typical characteristics of Mullard XF3 production from the 1970s, highly sought after today for build quality, operational stability, and authentic British sound character.

All four tubes have been tested in our laboratory using the Amplitrex AT-1000 Tube Tester. Both pairs received a VERY STRONG rating, with stable emission, absence of shorts and gas, and very solid electrical values.

Sonically, they offer the classic Mullard character: deep and controlled bass, rich, natural, and three-dimensional mids, smooth and never aggressive highs. The presentation is expansive, harmonically complete, and musically engaging, with excellent dynamics and great tonal naturalness.

Suitable for high-end hi-fi amplifiers, push-pull power amplifiers, dual mono configurations, vintage restorations, and guitar amplifiers compatible with EL34 / 6CA7.

A rare set consisting of two matched Mullard XF3 / Amperex Label NOS NIB pairs, genuinely tested and selected by Vacuum Tubes Treasures, ideal for those seeking four original British EL34s without compromising electrical coherence within each pair.

Test Results:

Tube tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 450V; Vg2 = 360; Vg = -30V
  • Average 100%: Gm = 4.4 ; Ia = 40 mA
  • Test Result: VERY STRONG

Tube 1: Gm = 7.5 ; Ia = 56 mA

Tube 2: Gm = 7.7 ; Ia = 54 mA

Tube 3: Gm = 6.6 ; Ia = 40 mA

Tube 4: Gm = 6.5 ; Ia = 37 mA

Additional tests performed:
  • Microphonics: Standard. Tested and suitable for use in hi-fi and guitar amplifiers.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Conditions:

  • Condition: NOS - NIB - New Old Stock, New In Box - Tested and working - In original box.
  • Functionality: Perfectly operational.
  • Cosmetic Condition: Excellent – Markings perfectly preserved, minimal signs of wear. See photos.

Manufacturing Code:

  • Xf3 B5C5 produced at Mullard's Blackburn (UK) plant in March 1975
  • Xf3 B5H3 produced at Mullard's Blackburn (UK) plant in August 1975

Discover why our tubes 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.

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