Restoration of a Zenith 500D transistor radio

In this video I start out with a completely dead radio with a scratched nylon case, but in restorable condition. I go through many tests, going in a couple of wrong directions. I eventually get back on the right track and get the radio working but the sound is bad. I find out the cause of that and correct it, finding out that sometimes your instruments don't always tell you the whole story. After fixing the radio, I refurbish the nylon case and make it presentable. After it's all together and working, I demonstrate the remarkable sensitivity of this particular model of Zenith portable.

[@rlysitt]

I also have never seen a speaker like that.

[@FranksPlace-jk7pj]

It seems to be only used in the 500D, the earlier 500's have a conventional speaker, I don't know if they used it again in any model after 1958.