If I recall correctly, the PowerBook 140 needs a 7.5V x 2A (a little bit more on the current side won't hurt anyway) power adapter.
Although it won't be particularly pretty, a common Sony PSOne power brick would perfectly do and they're probably fairly cheap these days.
If you want to keep the original power adapter and you're capable of doing a little bit of soldering, though, I'd follow Ferrix suggest and simply do a recap.
Although it won't be particularly pretty, a common Sony PSOne power brick would perfectly do and they're probably fairly cheap these days.
If you want to keep the original power adapter and you're capable of doing a little bit of soldering, though, I'd follow Ferrix suggest and simply do a recap.