Awesome, when building crystal radios out in the sticks as a kid, getting my hands on a suitable crystal diode was one of my problems. The other problem was ge

Awesome, when building crystal radios out in the sticks as a kid, getting my hands on a suitable crystal diode was one of my problems. The other problem was getting a crystal earpiece. I guess a rather complicated way around that would be to make some kind of DIY vacuum tube amplifier and make an electromagnetic speaker.