2pcs Vacuum Tube 6Z4 7Pin Electron Tube Rectifier Diode Replacement 6U4 for Audio Amplifier Product highlights Purposebuilt rectifier: Converts AC to DC to supply stable plate voltages for tube audio amplifiers and other vintage equipment. Direct replacement: Compatible with equipment that uses 6Z4 or 6U4 style 7pin rectifier tubes. Fits standard 7pin bases designed for this tube family. Reliable construction: Vacuumsealed glass envelope with metal internal elements and sturdy 7pin base for consistent electrical contact and long service life under normal operating conditions. Compact form factor: Standard 7pin size for easy dropin installation in compatible amplifier sockets. Consistent performance: Provides dependable rectification to help maintain stable power supply rails and reduce irregular voltagerelated noise. Why customers need this product Restores functionality to amplifiers that have failed or noisy rectifier tubes. Keeps vintage or DIY tube audio equipment operating as designed by replacing worn or damaged rectifier diodes. Provides a ready spare so you can minimize downtime during repairs or maintenance. Key attributes Function: Electron tube rectifier diode for AC to DC conversion in tube power supplies. Models and compatibility: 6Z4, replacement for 6U4 type 7pin rectifier tubes; intended for devices specified to use these tube types. Size: Standard 7pin base; compact vacuum tube envelope suited to common tube amplifier sockets. Material: Glass vacuum envelope and metal internal components with durable pin contacts. Performance: Stable rectification suitable for audio amplifier power supplies and similar vintage electronic applications. Use scenarios Repairing a vintage tube audio amplifier that uses a 6Z4 or 6U4 7pin rectifier tube to restore proper DC supply and reduce hum. Replacing a failed rectifier during routine maintenance on a studio or hifi tube amplifier to the unit to reliable operation. Building or modifying a custom tube amplifier or DIY audio project that requires a standard 7pin rectifier tube for power supply conversion. Installation note Confirm that your equipment specifies a 6Z4 or 6U4 compatible 7pin rectifier before installation. Handle tubes carefully and allow equipment to cool and discharge stored capacitors before replacing tubes.