Low current boost converter modules up to 110V at 1A?

[Chris56000]

Hi!

I'm thinking of building the Sussex Valve Tester on the Vintage Radio Forum, what I would like to add to it is a Step Up Boost Converter Module to test series–operated valves, where the heaters may be up to 70V, but not a large current – 500mA is adequate!

Does anyone know of any cheap modules, either in kit form or built, that can give up to about 70–100V (max) at 500mA that can be varied down to about 15V?

Ideally I want one mainly through–hole parts, and as cheap as possible –  £15 max!

There is a 12–80V one but it's quite big with a large heatsink, and I'm looking for a smaller sized one!

I've asked in this Forum as the Members here have a much wider view of whats available, and also the Vintage Radio Forum bans ebay links – it is much more strictly moderated!

Chris Williams