ULTRON EF86 / 6267 – SINGLE PENTODE TUBE (1 PC)
Grey Round Plate
Big Top Ring Getter
Low-Noise Audio Pentode EF86 / 6267
New in Original Box
Amplitrex AT1000 Tested
Up for sale is a single (1 pc) vintage NOS Ultron EF86 / 6267 low-noise audio pentode vacuum tube, complete in its original vintage orange and blue Ultron box. Featuring classic Ultron crown logo graphics, a grey round internal plate shielding structure, and a big top ring getter, this European-made valve is sought after for its silent noise floor, microphonic suppression, and detailed harmonic clarity. An ideal upgrade or replacement tube for Vox AC15/AC30 V1 channels, high-end audio 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:5495001 | Single Pentode | 3.0 mA | 1.5 mA | 50% | 1800 | 1500 | 83% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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