Up for sale is 1 Pc vintage NOS RCA 5Z3 full-wave rectifier vacuum tube, manufactured in the USA[cite: 8]. Featuring classic black plates, a top side square getter structure, clear glass, and a sturdy black base, this desirable vintage rectifier tube is revered for providing robust power supply filtering, superb dynamics, and smooth musical delivery[cite: 8]. Supplied new in its original RCA box, this tube is an ideal choice for vintage audio amplifiers, custom tube power supplies, and restoration projects requiring a high-grade 5Z3 rectifier.

This tube has been fully tested on a precision Hickok 752A mutual conductance tube tester[cite: 6, 8]. Detailed test measurements for Mutual Conductance (Gm) across both plate sections are provided in the table below.