TUNGSRAM EF86 / 6267 – MATCHED PENTODE PAIR (2 PCS)
Top Ring Getter
Round Grey Plate / Shield
Low-Noise Audio Pentode EF86 / 6267
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 pcs) of vintage NOS Tungsram EF86 / 6267 low-noise audio pentode vacuum tubes, supplied in individual white boxes[cite: 17]. Featuring authentic yellow Tungsram logo graphics, round grey internal plate shielding structures, and top ring getters[cite: 17], these vintage European valves are highly regarded for robust construction, excellent microphonic suppression, detailed high-frequency response, and ultra-quiet background operation. An ideal matched pair upgrade or replacement for Vox AC15/AC30 V1 channels, high-end tube preamplifiers, and studio condenser microphone preamps.
Both tubes have been fully tested on a precision Amplitrex AT1000 tube tester[cite: 17]. 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.935006 | Single Pentode | 3.0 mA | 2.1 mA | 70% | 1800 | 1800 | 100% |
| SR.NO.935007 | Single Pentode | 3.0 mA | 2.1 mA | 70% | 1800 | 1900 | 106% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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