Hi, I had a 230 for years, that I used to power using a regulated universal adapter, with the correct voltage setting and plug. It worked like a charm. I don't think the original adapter would add anything more than being genuine, it was an ordinary design.
If I remember correctly, the best voltage setting was 6V, not 4.5V, Which makes sense since there was a 4.8V accessory battery that was supposed to be charged internally from the power input. 4.5V was not enough to fully charge it.