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Rare NOS matched and code-matched pair of Amperex PQ 5920/E90CC premium dual-triode tubes, manufactured by Philips in Heerlen, Holland.
Both tubes feature the highly desirable early pinched-waist glass construction and carry matching etched Δ7L codes, identifying Heerlen production from December 1957.
Hickok tested:
Tube 1: 2,600 / 2,800 GM
Tube 2: 2,800 / 2,750 GM
The Hickok new-old-stock reference is 2,800 GM. All four sections test strong and the two tubes are closely matched overall.
Excellent early Dutch Amperex pair for a collector, premium audio application, or vintage equipment restoration. Original lettering and cosmetic condition are shown in the photographs.
Tubes will be carefully packed for safe shipment
