Today’s search brought up something very familiar, [Jazzy Jane] has an Advance E1 tube signal generator ... some adjustability for the inbuilt audio oscillator which had a fixed frequency ...

[Debraj] needed a simple signal generator for a project he was working ... Upon plugging his scope into his sound card’s audio jack, he observed that the PC had good frequency fidelity, though ...

This battery operated function generator, encased in a rugged high visibility shell with a spill proof ... Designed for cabling and wiring troubleshooting, machinery speed signal simulation, audio ...