Philips EZ81/6CA4 NOS Matched Quad Black Plate
NOS
Black Plate
Top Ring Getter
Made in Holland
Black Plate
Top Ring Getter
Made in Holland
Available for purchase is an exceptionally rare, perfectly matched quad of Philips EZ81 rectifier tubes. These authentic Dutch-made valves feature the classic Black Plate design and Top Ring Getter, renowned for their superior thermal stability and reliability in high-fidelity power supplies. All four units are New Old Stock (NOS) and are supplied in their iconic original blue and yellow Philips packaging.
- Type: EZ81 / 6CA4
- Brand: Philips
- Condition: New in Original Boxes
- Construction: Black Plate / Top Ring Getter
- Origin: Made in Holland
- Testing: Amplitrex AT1000
Dutch Engineering: These tubes carry the “MADE IN HOLLAND” etchings and distinct factory codes (B6A1, B5L4) associated with premium Philips production.
Perfect Matching: This quad has been laboratory matched on the Amplitrex AT1000. All four tubes show identical forward current (959uA/961uA) for ultimate circuit symmetry.
NOS Quality: Clean glass, bright flashing, and firm pins in collectible original boxes.
Perfect Matching: This quad has been laboratory matched on the Amplitrex AT1000. All four tubes show identical forward current (959uA/961uA) for ultimate circuit symmetry.
NOS Quality: Clean glass, bright flashing, and firm pins in collectible original boxes.
| Serial No. | Factory Code | Plate A (FWD) | Plate B (FWD) |
|---|---|---|---|
| 944016 | B5L4 | 959 uA | 961 uA |
| 944008 | B5L4 | 959 uA | 961 uA |
| 944020 | B5L4 | 959 uA | 961 uA |
| 944018 | B6A1 | 959 uA | 961 uA |
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