Here is what the scope signal from the WR-50B should look like, this is taken with the RF output frequency on the VFO set at 1000 kHz. The signal outputs of this particular tube generator should appear “relatively” clean, it was one of the lesser of the evils of service grade generators, just don’t expect the quality of signals you would get from a lab type generator that cost thousands of dollars.
Picture 1 is the analog scope display of the RF output, that being the 400 kHz modulated signal (This is a 400 kHz constant on the WR50’s) with the 1000 kHz RF signal applied. The WR50B will only allow up to 30% modulation.
Picture 2 is a stored display of the same RF output. It attempts to capture the 1000 kHz RF carrier signal within the 400 kHz modulated envelope just to give you an idea of what is really going on, however the analog signal is the representation of what the modulated AM output of the WR50B should really look like.
Picture 3 shows the 1000 kHz signal when the modulation is removed, it's just your basic sine wave.
When you view the 455 kHz and 10.7 MHz sweep outputs of the WR50, you’ll just see the modulated envelope grow and shrink a little as the carrier signal sweeps (moves up and down) in frequency a little bit.
You can view the sweep displays they show in the manual with a standard scope using its line triggering mode or using a 60 Hz external trigger. But, these displays don’t show much of anything other than 2 lines or the marker if you add a crystal to generate it. I rarely use the 2 sweep outputs of this generator as I can use the frequency counter to verify I have the WR50’s VFO generated RF output at the exact frequencies the alignment procedures call for. It will be nice to have an HP synthesized signal generator some day.
Sorry for the somewhat blurry scope photos. Too much coffee = shakes.