SYLVANIA GB-5687 – MATCHED PAIR (2 PCS)
GRADE: PLATINUM SERIES | USA MANUFACTURE
Black Plate
Gold Pins
Ring Getter
Dual Triode 5687 / GB-5687
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 Pcs) of vintage NOS Sylvania Gold Brand GB-5687 dual triode vacuum tubes, manufactured in the USA. Premium grade construction featuring sturdy black plates, ring getters, and gold-plated pins for maximum conductivity and long-term performance. Supplied in new white boxes, this pair is widely acclaimed by audiophiles for driving stages, preamplifiers, and headphone amplifiers requiring top-shelf 5687 / 7119 / 6900 family tubes.
Both tubes have been fully tested on an advanced digital Amplitrex AT1000 tube tester. Detailed laboratory measurements for Plate Current (Ip in mA) and Mutual Conductance (uMhos) alongside percentage performance ratings relative to specified reference specs (12.0 mA / 5400 µmhos) are presented in the table below.
| Serial No. | Triode Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | ||
| SR.NO.5408003 | Triode 1 | 12.0 mA | 14.4 mA | 120% | 5400 | 5100 | 94% |
| Triode 2 | 12.0 mA | 15.5 mA | 129% | 5400 | 5520 | 102% | |
| SR.NO.5408001 | Triode 1 | 12.0 mA | 13.0 mA | 108% | 5400 | 5120 | 95% |
| Triode 2 | 12.0 mA | 12.4 mA | 103% | 5400 | 4900 | 91% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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