1PC 7591 to 7868 Vacuum Tube Socket Adapter 7591 to 7868 Description This singlepiece adapter lets a 7591 tube with a cap be used in equipment that accepts a 7868 socket. Designed for straightforward, plugin conversion, it provides a reliable mechanical and electrical connection without permanent modification to the original socket. Key benefits Simple compatibility solution: Enables use of 7591 tubes in 7868 sockets without rewiring or soldering. Saves time and cost: Quick plugin installation for testing, temporary swaps, or permanent replacements. Secure fit and stable contact: Engineered for consistent alignment and electrical contact to minimize intermittent connections. Features and attributes Function: Converts 7591 cap style tube to fit a 7868 socket. Compatibility: Specifically for 7591 () tubes and 7868 sockets. Quantity: 1 piece included. Construction: Compact adapter body with insulated housing and metal contact points for electrical connection. Size and fit: Designed to match standard octal socket spacing and clearances for straightforward installation. Performance: Intended to maintain secure contact under normal operating conditions in audio and radio equipment. Use scenarios Tube amplifier : a failed 7868 tube with a 7591 tube using the adapter for immediate restoration and testing. Vintage radio restoration: Fit available 7591 tubes where 7868 sockets are present to continue operation during parts substitution. Bench testing and diagnostics: Quickly swap tube types during troubleshooting without modifying the original tube socket. Installation notes Plug the adapter into the 7868 socket, then seat the 7591 tube into the adapter following normal tube handling precautions. Ensure equipment is powered off and discharged before changing tubes. What is included One 7591 to 7868 vacuum tube socket adapter. This adapter provides a practical, noninvasive way to adapt tube types for , testing, and substitution while keeping original sockets intact.