https://www.radiomuseum.org/r/heath_test_oscillator_hf_to_1.htmlbut you have to join to download it.
Amplitude modulated, HF test oscillator. Five fixed frequencies selected by switch: 262, 455, 465, 600, 1400 KHz. Two crystal sockets on the front panel for optional frequencies. Accuracy: + -0.5%. LF modulation: 400Hz at 30%. Available outputs: continuous HF, modulated HF and LF (by switching). Continuously adjustable output level. LF output level: 10V. HF output level: 0.1V.