Philips EF86 Mesh Plate Quad – Vintage Tested

We are proud to offer a genuine Philips EF86 Mesh Plate Quad (4 tubes) for the discerning collector and audio engineer. The EF86 (equivalent to the 6267) is a high-gain audio pentode designed specifically for low-level input stages where silence is golden. Unlike later solid-plate versions, these vintage specimens feature the intricate “Mesh Plate” construction, a hallmark of 1950s and early 60s European manufacturing excellence.

Provenance and Date Codes
Upon close inspection of the glass envelopes, we have identified codes such as 8Y1 L5K2, 8Y2, and 8Y1. These markings are significant:

Code 8Y: The official Philips type code for the EF86 / 6267.
Code L: This crucial delta code indicates production at the MBLE factory in Brussels, Belgium (Manufacture Belge de Lampes et de Matériel í‰lectronique). This plant was a crown jewel in the Philips/Mullard empire, known for producing tubes with exceptional linearity and longevity.
Mesh Construction: clearly visible in the photos, the fine wire mesh anode acts as a superior Faraday cage compared to solid metal plates. This design reduces internal resonances and creates a “dead silent” background, allowing the nuances of the music to shine through.

Condition and Technical Testing
While these tubes do not include their original boxes, they are in excellent physical condition with clear glass and intact flashing.

Testing Method: Each tube in this Philips EF86 Mesh Plate Quad has been tested for emission using a calibrated Kyoritsu Model K-119 Tube Tester.
Results: As detailed in the product gallery, all four tubes register firmly in the green “GOOD” sector of the meter. This indicates a healthy cathode and plenty of remaining operational life.
Note: These are sold as used/tested vintage electronic components. They are matched by their strong emission status and manufacturing batch, ensuring consistent performance.

Ideal Applications
This Philips EF86 Mesh Plate Quad is the ultimate upgrade for:

Guitar Amplifiers: The “Magic Channel” of vintage VOX AC15 and early AC30 amplifiers relies heavily on the EF86. The mesh plate version is critical for preventing the “rattle” often heard in combo amps.
High-Fidelity Audio: Perfect for the pre-amplification stages of classic British Hi-Fi gear like the LEAK Stereo 20, Quad II, and Mullard 5-10 designs.
Studio Equipment: An excellent choice for DIY tube microphone builds (U67 clones) or vintage mic preamps requiring high gain with minimal noise floor.

Technical Specifications (Summary)

Type: A.F. Pentode (Low Hum/Microphony).
Base: B9A (Noval).
Filament: 6.3V / 0.2A.
Anode Voltage: 250V (Typical).
Origin: Belgium (MBLE Brussels).

Don’t settle for modern reproductions. Invest in the history and tone of this authentic Philips EF86 Mesh Plate Quad.

Frequently Asked Questions (FAQ)

Q: Are these tubes New Old Stock (NOS)?
A: Without the original boxes, we categorize them as “Used/Tested Strong.” However, the physical condition and the strong results on the Kyoritsu tester suggest this Philips EF86 Mesh Plate Quad has seen very little use.

Q: Why are “Mesh Plates” more expensive than standard EF86 tubes?
A: The mesh construction was more difficult and costly to manufacture. It provides better structural rigidity (less microphonic noise) and better electrostatic shielding than the cheaper solid plates that replaced them in the late 1960s.

Q: Will these work in a Dr. Z Z-28 or modern VOX amp?
A: Yes, as long as the amplifier uses the EF86 / 6267 tube type. This Philips EF86 Mesh Plate Quad is often considered a tonal upgrade for modern boutique amplifiers, offering a warmer, more 3D sound.