6EU7 MULLARD Blackburn Short Plates Matched Pair Made in GT. BRITAIN ’60s - AMPLITREX Tested

6EU7 MULLARD Blackburn Short Plates – Matched Pair – Made in GT. BRITAIN ’60s
AMPLITREX Tested – VERY STRONG – Low Noise & Microphonics

Description:

This pair of 6EU7 Mullard Blackburn tubes, Made in GT. BRITAIN in the 1960s, represents a highly sought-after selection for those seeking the authentic musical character of the best vintage British productions.

The 6EU7 is a high-gain dual triode, electrically similar to the 12AX7/ECC83 family but with different pinouts, often used in hi-fi and musical amplifiers where a quiet, stable tube capable of delivering rich and refined tonal rendering is required.

The Short Plates Mullard Blackburn construction is particularly valued for its balance, naturalness, and harmonic density. This pair has been selected as a Matched Pair, tested on an AMPLITREX AT-1000 Tube Tester, and classified as VERY STRONG, with Low Noise & Microphonics behavior.

These are vintage tubes that have been tested and are in perfect working order. Aesthetically, one of the two tubes no longer has its silkscreen on the glass, but the identification remains consistent with the internal construction and Mullard Blackburn characteristics. Please refer to the photos for aesthetic details.

Sonic Characteristics

The 6EU7 Mullard Blackburn offers a full, elegant, and very musical sound, with a typically British tonal signature: body, fluidity, rich mids, and a never fatiguing presentation.

Bass
The bass is round, controlled, and well integrated into the musical message. It doesn't aim for artificial impact, but provides a solid, natural, and consistent foundation.

Mids
The mid-range is the true strength: vocals, guitars, strings, and acoustic instruments sound present, dense, and harmonically credible, with that pleasant physicality typical of the best Mullard productions.

Highs
The highs are sweet, refined, and well-extended, without harshness. The high range contributes to a sense of continuous musicality, maintaining detail and airiness without becoming aggressive.

Dynamics
The dynamic response is fluid and progressive, with excellent ability to follow musical variations without stiffening the reproduction. The pair is stable, consistent, and pleasant even during prolonged listening sessions.

Soundstage
The soundstage is orderly, natural, and well-proportioned, with good depth and credible instrument separation. The presentation favors cohesion and musicality rather than an artificially analytical effect.

🎧 Use in Hi-Fi Amplifiers

In the hi-fi domain, this pair is suitable for equipment compatible with the 6EU7, especially where a refined, silent, and musically engaging sound is desired. The Low Noise & Microphonics selection makes it suitable even for sensitive circuits, always provided the equipment is correctly compatible.

🎸 Use in Musical Applications

In instrument amplifiers using 6EU7, this Mullard Blackburn pair can offer a warm, harmonically rich, and very expressive tone. It is particularly interesting for those seeking a vintage response, with progressive saturation, full mids, and a sweet yet present high range.

🎯 Note for audiophiles

This is a selected and tested Matched Pair Mullard Blackburn, with a VERY STRONG result and Low Noise & Microphonics behavior. One of the two tubes lacks silkscreen on the glass, but the pair retains full technical and sonic interest thanks to its consistent construction, matching, and high test results.

A rare and musically captivating Mullard Blackburn pair, designed for those who wish to enhance their equipment with a vintage British selection, strong, quiet, and rich in authentic vintage sonic character.

Test Results:

Tube tested on AMPLITREX AT-1000 Tube tester:
Voltage Test: Va = 250V, Vg = -2V
Average 100% Gm = 1.6; Ia = 1.2 mA
TEST RESULT: VERY STRONG

Tube 1:

• Section 1: Gm = 1.6; Ia = 1.0 mA
• Section 2: Gm = 1.6; Ia = 1.1 mA

Tube 2:

• Section 1: Gm = 1.6; Ia = 1.2 mA
• Section 2: Gm = 1.4; Ia = 0.8 mA

• Microphonics: Low. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1 position.
• Noise: Low and well controlled. Quiet operation in hi-fi and musical amplifiers in designated positions.
• Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
• Shorts and GAS: Absent.

Conditions:

• Conditions: Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.
  
• Functionality: Fully operational.
  
• Aesthetic Conditions: One tube with missing silkscreen on the glass. See photos for details.
  
• Manufacturing Code: B3G1→ B → Mullard, Blackburn - 3 (out of four digits) → 1963 - G → July - 1 → 1st week of the month
  

Discover why our tubes are different →