W8JI Technical pagespop
- Amplifier, vacuum tube, receiving beverage loop vertical and transmitting antenna system technical information radiation resistance, EH antenna, noise,receivers, and information on keyclicks.
Kipsala DX Club
- All about amateur radio, radiotechnique and radiosport. Large FAQ (not only for newcomers). How to become a ham. How to learn the Morse code. Technical and operating references in Russian
- Monitors the space weather parameters essential for HF radio, including SSN/SFI, Ap/Kp, X-ray/Proton flux, and Auroral activity. IonoProbe downloads near-real time satellite and ground station data, stores information for future use and displays it in a user-friendly way.
QRO via Russia
- Power amplifiers from amateur radio operators around the world which are designed/built using Russiantubes.
Tube Amplifier data and tech info
- Source of common model manuals and amateur help on amplifier problems for the amateur bands, Discussion of vacuum tube amplifiers. Technical information and discussion of obselete tube replacement.