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That is an improvement. We don't need FM unless we need FM, if you get the drift (pun intended).
My Measurements Model 80 modulates the oscillator also. The benefit is that you can get FM from a signal generator that should have an FM function but doesn't. I found that a modest amount of AM produced plenty of FM for aligning VHF ham radios and such.
The Marconi TF1066/4B has separate AM and FM functions but since it modulates the oscillator for AM, it gives FM even if not asked for. And my Precision E200-C also is a modulated oscillator.
I wonder what was going on in the minds of the engineers. The HP606A goes to great lengths to eliminate incidental FM, and does a good job of it.
I have all these generators, trying to sell them off. My recently acquired HP synthesized unit puts them all to shame with its accurate and stable frequency; I can calibrate my ham transceivers with it, with 1 Hz resolution and a crystal oven.
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