4pcs 6J4 Vacuum tube (~6AC7 ~6AJ7 ~1649 ~1682 ~6134 ~6AB7) Metal Base NOS VALVE | eBay
6X4 Datasheet PDF ( Pinout ) - Full Wave Vacuum Rectifier
6X4 Tube Full Wave High Vacuum Rectifier, Various US Brands. Miniature heater-cathode type twin diode designed for full-wave rectifier operation in compact power supplies. MFR: RCA. SKU: 6X4. New old stock. No