In America, the popular rectifier tube 5Z3 is made by RCA. The leg pins are UX, so they are the same as 2A3 and 300B. The electrical characteristics are the same as 5U4G.
A long time ago, when making 2A3 or 300B amplifiers, It is used as a combination ball. Lately, I haven't really seen it.
We have confirmed the operation including noise on TV-7 or actual equipment. It's NOS.
The boxes vary, including original boxes and white boxes. In addition, it is an extremely scarce item, so Please contact us for stock availability.