[Helge Fyske (LA6NCA)] may not be an actual spy — then again, he may be; if he’s good at it, we wouldn’t know — but he has built a couple of neat vacuum tube spy radios in the past. And there’s no ...

This is part of a Lowell & Dunmore batteryless receiver made at the Bureau of Standards. Square wood box with hinged lid, bakelite top-plate with four binding posts, rectifier tube mounts in top of ...

Typewritten schematic. "Power supply unit - for transmitter and receiver" found with unit. Unit consists of: three unmarked coil-core transformers, five Tobe Precision condensers, a Leroy M.E.

Even though manufacturers of handheld ham radios have been busy adding all sorts of bells and whistles into their portable offerings, for some reason, many of them lack a modern USB-C port. In the ...

This artist illustration shows the SpaceX Crew Dragon spacecraft docking to the International Space Station. SpaceX is one of two American companies working with NASA to design, build, test and ...

The power supply is often the first component to fail in broadcast equipment, whether due to line surges, overheating or component aging. A client of Frank Hertel had a console with an internal switch ...

NAMM 2025: AmpRx has unveiled Brownie, an voltage optimising power supply that’s designed to give your tube amp exactly what ...

Wall-mounted AC Adaptors, sometimes called wall-warts, have been a standard way of providing electricity to low-power devices since the 1970s, powering everything from clock radios to Wi-Fi routers to ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. NASA engineers have ...