TUNG-SOL USA 6X4 EZ90 Valve Tube Black Plate Square Getter NOS Boxed (V38) | eBay
6X4 / 6X4WA / 6202 / EZ90 NOS Gleichrichterröhre
6X4 Heater-cathode potential issue | diyAudio
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
NOS Sylvania 6X4 EZ90 Full Wave Rectifier Vacuum Tube - Tested | eBay