I am in the finishing stages of a power supply that can do what you require.
It is variable from 0V to 13.25Kv and can be modulated as I have tried modulating it.
It takes 28 stages of voltage multiplication to get that high and you wont need but 6 or 8 stages for your voltage range.
I have modulated it up about 70Hz and the removal of a few filter caps should allow me to go much higher.
It will definitely do 10Hz as well as sub 1Hz for that matter.
Once I get the voltage feedback regulation circuit done I will be able to modulate it to its full voltage range.
I have it fully documented here,
https://www.diyaudio.com/forums/pla...tor-insulation-mylar-coating.html#post2531218
So have a look at maybe it will give you a good idea of how to go about this.
I have a nicer and much simpler version in mind as well and is mentioned in the thread and I will be working on that version soon.
Besides what I have designed it to do,the fact that it can be modulated opens up a whole new world IMO.
If you have any questions about it I will be happy to explain as it is a pretty straight forward and classic design.
enjoy !!
jer
P.S. Please read the whole thread as the link was just the basic schematic and when it is finished I will present the complete as finished schematic.