This listing is for a NOS HALTRON 6X4 tube, which is also known by the codes 6Z31, EZ90, CV493, U78, V2M70, and U707. The price is for one out of seven NOS tubes available. These tubes were made in the US during the 1960s and feature a construction with black plates and a square getter.
Each tube has been tested and is rated GOOD, with a minimum reading of 40 on the TV-7U scale, as shown in the pictures. This is a vintage small rectifier tube!
Shipping via registered airmail with tracking number. Import fees for U.S. buyers are included in the shipping cost under the new tariff regulations. Other methods available upon request.