hi
as said you could also put a 1nf and a 470pf in parallel that will give you .00147 wich is preety close. 1nf is easy to get...470pf maybe you need to order it or if you search locally maybe you will only find ceramic discs wich are not very good for that application because they drift with temperature changes
also if you search on mouser for 1500pf capacitors of 1600volts or higher you get about 400 parts
you have some nice orange drops and the usual rectangular plastic caps that are epoxy-dipped
you also have the wima mkp or fkp etc
i wonder if you serched for the wrong value because they have a bunch of them
https://pt.mouser.com/ProductDetail/...9irIy0rgpp4%3D
other important thing:
make sure you use mkp fkp or other AC pulse capacitor when you are recapping anything connected to the plate of the vertical output or when recapping next to the horizontal output or for the boost filter..regular caps may not last there and their DC voltage rating may not mean anything there.