A tin-plated tube base converter/adapter for cross-compatibility between 8-pin and 4-pin tube sockets, letting you run a 5Z3 in a socket wired for a 274B (or vice versa) without rewiring the chassis. A handy way to experiment with tube substitutions on hi-fi and guitar amp rectifier stages without committing to a permanent socket change.
Solidly built pins and a tight socket fit keep the connection reliable under the heat and vibration of normal amp use. A go-to part for tube rollers and amp techs who want flexibility across different rectifier tube families.
