First of all. Hugh, transmitters do not need very good filtering of their HV at their output stages.

 If I had to build such a supply, I would use a small-value choke, even a couple of Henries would be plenty, and one or two of those oil filled caps on the output. Depending on your transformer, you could use one or two at the input of the choke too if you wished.

Low-level stages need good filtering, though, especially oscillators. 

How many of those oil filled caps do you have?

Ken W7EKB

I will need to build a power supply that gives me 1000 volts for a WW2 era aircraft radio. I have had these oil caps now for decades. But - they are only 4 mfd. Sp i am wondering, to get any useful mfd count i would have to use at least 3 - 4 of these and that weight adds up. Weight is an enemy. So i'm wondering, better to just stack up some modern lytics of the 450 volt flavor and have much less poundage? The thing with lytics tho, they do not last forever. These oil caps if they do not develop.a leak last a lot more like forever. What do you think?

I am thinking about 1000 volts not more than 150 mA. I was wondering if i could even get by without a big heavy choke. This is a CW only radio.

-Hue Miller