That amp, and the Elekit, were the first bits of Audio gear I had built in about 65 years!  I had built radios and an amp  in the late 50s or early 60s.

I had done a few digital (non-audio) wire wrapped projects including a clock using LSI (74HC) chips after I found that my audio system clock (Stanford Research) emitted an incredibly precise 1 pulse per second, my daughter did a WOW so I built one for her using a 32kHz TCXO chip - similar to those used in DACs, but much lower in frequency.