Offered here is an exceptional matched quad lot of 4 vintage PHILIPS-MINIWATT EF39 RF/IF pentode valves, production dated to the golden 1940s era. Made in Great Britain, these iconic classic tubes feature their distinctive original Red Coated Glass, a Top Cap Pentode layout, and a durable Black Base. Which comes in Original box.

This complete batch has been professionally tested and verified on the Amplitrex AT1000 digital tester,  Following the standard grid layout verified in image’s , the percentage calculations below show how each tube performs against standard 100% factory specifications ( Ia = 6.0 mA /  MA/V = 2.2).