So you will be building 2 x HPA, one with +/- 15V and the other +/- 18V so not so similar (although it is clear both can be built with +/- 15V). Are you sure this is all logical thinking?
No, I'll be building both with +-15 when I actually get around to it, but I'm theorizing how much it'd take to get them working on +-18.
Answer: probably not worth the effort 🙄
Answer: probably not worth the effort 🙄