5Z3, NATIONAL UNION, VT-145, BLACK BASE, CHARCOAL SMOOTH ANODES, US NAVY, OCTOBER 1943 PRODUCTION
5Z3, NATIONAL UNION, VT-145 BLACK BASE, CHARCOAL SMOOTH ANODES, US NAVY OCTOBER 1943 PRODUCTION
Well, what a special device, essentially a U52 mounted on a UX4 base, this is a superb valve indeed showing full emission for each diode section on test.
The 5Z3 is a high power rectifier and was typically used in small radio transmitters, high power audio amplifiers, and modulators for amplitude modulation (AM) transmitters. Much like the famed U52, the filaments are inverted 'v's of coated ribbon. The valve is mounted on a UX4 base pins, The type 5Z3 was first marketed and sold in 1936.
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