SYLVANIA 5687WA – MATCHED PAIR (2 PCS)
PLATINUM GRADE | MADE IN USA
Made in USA
Black Plate
Top Ring Getter
Dual Triode 5687 / 5687WA
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 Pcs) of vintage NOS Sylvania 5687WA military-grade dual triode vacuum tubes, manufactured in the USA. Built to ruggedized “WA” specifications featuring black plates and a top ring getter structure, these tubes deliver exceptional dynamics, rich tone, and low noise. Supplied in new white boxes, this pair is ideal for high-end audio preamplifiers, driver stages, and headphone amplifiers designed for 5687 / 7119 family tubes.
Both tubes have been fully tested on an advanced digital Amplitrex AT1000 tube tester. Complete 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.3028002 | Triode 1 | 12.0 mA | 16.0 mA | 133% | 5400 | 5300 | 98% |
| Triode 2 | 12.0 mA | 14.4 mA | 120% | 5400 | 5100 | 94% | |
| SR.NO.3028001 | Triode 1 | 12.0 mA | 16.2 mA | 135% | 5400 | 5600 | 104% |
| Triode 2 | 12.0 mA | 16.2 mA | 135% | 5400 | 5870 | 109% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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