"Glowbug" is a term used by US amateurs to describe a simple home-made tube-type radio set, reminiscent of the shortwave radio-building craze of the 1920s and 30s. Generally, any small, home-built tube-type transmitter or receiver may be referred to as a glowbug.
"Glowbug" is a term used by US enthusiasts to denote an easy-to-build tube-type radio apparatus, akin to the shortwave radio-building trend of the 1920s and 30s. Typically, any small, homemade tube-type transmitter or receiver can be referred to as a glowbug.