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Electronic M and jr_tech took the words right out of my mouth.
The measurements I did were with a 10Megohm scope probe and a 10Megohm input DMM, so they did not load the output very much at all. Part of the mod I did was to take the plate signal on the 6C4 through a 0.1 uf capacitor directly to the output connector. It does not connect to the 1 Megohm pot so it isn't variable. It is an example of the maximum signal you might see. The original circuit allowed it to be decreased with the pot.
Also I confirmed that you need to set the control for internal modulation.
When you select external modulation the oscillator circuit is rearranged to form an amplifier/driver that takes the input audio signal and drives the modulation. In your video I think you had it set to external.
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