A set of NEC 2E26 and RCA 6146B vacuum tubes. - Brand: NEC (Nippon Electric Company) - Model: 2E26 - Model: 6146B - Brand: RCA (Radio Corporation of America) These are power amplifier tubes often used for amateur radio, specifically in the VHF bands (50 MHz, 144 MHz). The 6146B has a higher output than the 2E26. They were also widely used in various types of commercial radio equipment, making them very popular tubes. Ideally, they would be purchased as a set of two. These are stock items for maintenance and have not been used. The boxes show signs of aging, with broken lids. They were likely purchased around 1970. Thank you for looking.