RCA 5687 Black Plate Matched Quad - 1960s NOS | Audio Driver

Superior Sound Supply selling some seriously special stock. This matched quad of RCA 5687 vacuum tubes represents a premium choice for high-end audio applications requiring substantial drive capability. Sourced as New Old Stock (NOS) in their original boxes, these black plate high-perveance dual triodes have been precision-tested to ensure a perfectly balanced set, offering the legendary reliability and sonic authority associated with vintage RCA production.

Technical Specifications

* Brand: RCA (Radio Corporation of America)

* Model: 5687 (High-Perveance Dual Triode)

* Plate Type: Black Plate

* Getter Type: Top Halo Getter

* Date Era: 1960s

* Country of Origin: USA

* Condition: NOS (New Old Stock), Matched Quad (4 Tubes)

* Test Status: Pass for Shorts, Leakage, and Emissions on Precision Model 612

Condition Details

This quad set is in exceptional New Old Stock condition. The cosmetic presentation is clean, with clear glass and bold, legible orange "RCA ELECTRON TUBE" printing. The pins are straight and free of corrosion. All four tubes are housed in their original red and white RCA boxes, which show only minor shelf wear consistent with their age. Functionally, this set has been rigorously tested and matched to ensure uniform performance across all four units, making them ideal for stereo push-pull driver stages or complex audiophile builds.

Historical & Technical Context

The 5687 is a high-performance "super tube" often utilized in high-end audio designs (such as Audio Note and Manley) for driver stages and power preamplifiers. Unlike standard voltage amplifiers like the 12AU7, the 5687 features a high-perveance design with a massive cathode current capability of 65mA per section and a plate dissipation of 4.2W. The RCA Black Plate version is particularly desirable for its superior heat dissipation and robust construction. Its low plate resistance (1,600 ohms) allows it to drive difficult loads with ease, providing dynamic impact and control that standard miniature triodes cannot match. Please note: The 5687 draws significantly more heater current (900mA at 6.3V) than standard 9-pin tubes; ensure your power transformer is rated for this load.

Superior Sound Supply Guarantee

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Returns:

• New Items: Returnable within 30 days of delivery.

• Used & Vintage Items: Returnable within 30 days of delivery.

General Terms

Items must be returned in original, as-shipped condition with all original packaging and no signs of use. Buyer assumes responsibility for all return shipping costs unless the item was not received as described.

Make sure to check the return policy on each individual listing as some items may be sold "As-Described" and not eligible for a return. We want you to be completely satisfied with your purchase.