After searching for North American 1000w H34 mercury vapor ballasts, I have only been able to find a 210v/236v 60hz Wide lite version of a North American 1000w H34 mercury vapor ballast. Because of this, I am interested in knowing if North American 1000w H34 mercury vapor ballasts intended for 120v 60hz mains supplies even existed in the form of HX autotransformer ballasts and CWA ballasts. If such ballasts do indeed exist, I would be interested in knowing which manufacturers made them and what catalog numbers they would have.

If I had to bet on the existence of either of those, I'd go for the CWA. It's very unlikely a 120V HX H34 ballast ever existed because.... y'know, dat current draw 

To my knowledge, 400W is about as high a power as HX ballasts would ever get. I think some M400s back in the 60s were equipped with HX ballasts from the factory (as an option perhaps?).

I have seen some listings for some 1000w H36 mercury vapor HX autotransformer ballasts on GE’s I-Line ballast compatibility chart and they are listed as conventional/unregulated.

According to that Brochure, there are some 1000w H36 mercury vapor HX autotransformer ballasts designed for 120v 60hz mains. Here is a list of part numbers for those ballasts:

GE 9T65Y2250 120v 1000w H36 Lag

Jefferson Electric 232-1366 120v/240v/277v 1000w H36 Conventional, nonregulated

Jefferson Electric 232-2366 120v/240v/277v 2 lamp 1000w H36 Conventional, nonregulated

Jefferson Electric 233-1366 120v/240v/277v 1000w H36 Conventional, nonregulated

You can see the brochure with these ballast listing here:

https://www.lighting-gallery.net/gallery/albums/userpics/10384/ge_206-169_1-combined.pdf

In that case, 1000w H36 mercury vapor HX autotransformer ballasts do indeed exist, but I would figure that when looking at the possibility of 1000w H34 mercury vapor ballasts intended for 120v mains existing for the North American market, I would figure that CWA ballasts and high power factor HX autotransformer ballasts would be more likely to exist compared to low power factor HX autotransformer ballasts because ballasts with a higher power factor are able to draw less current than low power factor ballasts. Due to the rarity of such lamps and ballasts, 1000w H34 mercury vapor lamps, ballasts and fixtures designed for 120v 60hz mains are things that I really desire to have in my collection.

 I found my modern H34 ballast it 220v 60Hz choke ballast that VS
 Made.