[paulsherwin]

I would certainly change the BC148s. They aren't at all critical - anything NPN from the BC108 family will do, as will the 2N3904 and many other jellybean types. You can use pretty much any small signal Si type you have to hand. You will need to reset the quiescent current afterwards of course, but that's a good idea anyway after doing any work on radios of this type.