Where can I find old-style high-impedance (2,000 ohms or more) headphones?
By modern standards, the term “high impedance” when applied to headphones usually means anything between 100 and 600 ohms, but in the not too distant past, headsets of 2,000 ohms or more were in common use. These old-style hi-Z headsets have steel or mica diaphragms and are very efficient, achieving high volume with only millivolts of input. They are especially prized by Xtal radio owners, many of whom prefer to build their sets with “authentic” parts (Xtal or “crystal” radios do not use any transistors or batteries).
