I purchased 1972 woodie 42-258 last Summer. It has no electronics but 4 transducers.
I have read that most transducers are made by only a few companies and that they work on just a couple of frequencies. Is it possible to test the transducers to see if they work and if so which brands they would be compatible with? I'm pulling her this Spring for a bottom job. I've read mixed opinions on removal of old transducers vs drill a hole and install a new one. I just hate the idea of 5 transducers down there.