GEC EF86 / Z729 / 6267 – MATCHED PAIR (2 PCS)
Made in England
Long 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 closely matched pair (2 pcs) of rare vintage NOS GEC EF86 / Z729 / 6267 low-noise audio pentode vacuum tubes, supplied in individual white boxes. Made in England and featuring iconic green GEC logo labels, these coveted British valves are built with perforated mesh plate shielding structures and top ring getters. Celebrated among discerning audiophiles, studio engineers, and guitarists for an ultra-quiet noise floor, superb microphonic suppression, and lush, harmonic British midrange detail. An elite matched pair upgrade or replacement for Vox AC15/AC30 V1 channels, classic Leak and Quad hi-fi preamplifiers, and vintage studio condenser microphone preamps.
Both tubes have 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:5505001 | Single Pentode | 3.0 mA | 2.7 mA | 90% | 1800 | 2100 | 117% |
| SR.NO:5505004 | Single Pentode | 3.0 mA | 2.9 mA | 97% | 1800 | 2100 | 117% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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