TRIOTRON EF86 / 6267 – MATCHED PENTODE PAIR (2 PCS)
Made in Holland
Clear Glass Envelope
Top Ring Getter
Grey Round Shield / Plate
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 Triotron EF86 / 6267 low-noise audio pentode vacuum tubes, supplied in individual white boxes. Made in Holland, these Dutch-manufactured audio valves feature clear glass envelopes, grey round internal shield plates, and top ring getters. Highly prized by audiophiles and tone purists for their detailed highs, low microphonic response, smooth midrange presence, and ultra-quiet noise floor. An excellent matched pair upgrade or replacement for Vox AC15/AC30 V1 channels, high-end tube preamplifiers, and studio condenser microphone circuits.
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:5488007 | Single Pentode | 3.0 mA | 2.5 mA | 83% | 1800 | 2200 | 122% |
| SR.NO:5488009 | Single Pentode | 3.0 mA | 2.4 mA | 80% | 1800 | 2100 | 117% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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