MARCONI EF86-Z729 / 6267 – SINGLE PENTODE TUBE (1 PC)
British Made
Mesh Plate / Shield Construction
Top Ring Getter
Low-Noise Audio Pentode EF86 / Z729 / 6267
New in White Box
Amplitrex AT1000 Tested
Up for sale is a single (1 pc) rare vintage NOS Marconi EF86-Z729 / 6267 low-noise audio pentode vacuum tube, supplied in an individual white box. British-made with classic BVA markings, this highly sought-after valve features a perforated mesh plate shielding structure and a top ring getter. Celebrated by audiophiles and musicians for its ultra-low noise floor, superior microphonic rejection, and rich, detailed British midrange clarity. An ideal upgrade or replacement tube for Vox AC15/AC30 V1 channels, classic Leak and Quad hi-fi preamplifiers, and vintage studio condenser microphone preamps.
This tube has been fully tested on a precision Amplitrex AT1000 tube tester. Measured Plate Current (Ip in mA) and Mutual Conductance (uMhos) alongside percentage performance ratings relative to nominal factory reference specs (Reference: 3.0 mA / 1,800 uMhos) are detailed in the table below.
| Serial No. | Tube Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | ||
| SR.NO:5493001 | Single Pentode | 3.0 mA | 1.3 mA | 43% | 1800 | 1400 | 78% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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