This one uses two tubes from consumer grade TV receivers, the “P” at the start of the part number being the giveaway for a 300mA series heater chain. The RF triode-pentode isn’t a radio part ...

It is known to be very sensitive and seemed perfect for pulling in weak signals. So [Sjef] built this DIY radio and shares the details in this recent Spectrum post. Unlike older radio-on-chip ...

The National Capital Radio & Television Museum spotlights how airwaves have changed our lifestyles, from a 1921 DIY crystal ...