- AF4K Crystals by WD8DAS -
Steve Johnston, WD8DAS, has reopened AF4K Crystals!
There are two ways to order - the new online store and via email.
Click here to visit the AF4K Crystals online store
Or click the link below to send an email inquiry:
Click here to read reviews of AF4K Crystals
Click here to learn about the types of radio crystals and their history
Click here to watch the historical film "Crystals Go to War"