vacuum relay

Sparkmuseum - Vintage radio and scientific apparatus by john jenkins, include antique radios, Horn Loudspeakers, Vacuum Tubes, A.C. Receivers

ORRC - Oregon Region Relay Council

K7RPT Amateur Radio Relay Group, Inc. - Providing amateur radio 144 MHz & 440 MHz repeaters in the state of Oregon

Tubes.ru - specialize in trading Russian vacuum tubes used in broadcasting, amateur radio, Hi-Fi audio, meteorology, communication, medical applications and industr

Penta Laboratories - Penta Laboratories is a Manufacturer and Distributor of Vacuum Tubes, Capacitors and Electron Tubes for Broadcast, Industrial, Marine, Medical, and Avionics applications worldwide.

Viking Vintage - Restored vintage amateur radio, shortwave & other electronics from the vacuum tube era! Specialists in restored Ham Radio boatanchors

Tubeworld - Source for high quality new old stock vacuum tubes

Antique Radio Tubes For Sale  ^new - Radio Tubes, Audio tubes for sale, Antique Tube Supply - Your center for Vacuum Tubes for all your old Radio Tube gear.

Antenna Relay and distributor Box project - Have you problem with your RG cables ? This page describes a smart antenna box using an RG-cathode for 3 antennas. The remote control needs just a simple wire and the GND for remote-control

Non-relay instant RF Switching - Coax lines to do the RF switching. The advantages are instant switching, no power wasting DC control circuits.

12 to 28v Boost regolator - for those times when you have a 28v relay, but want to use it with a 12v source

About vacuum power tubes - KK5DR on RF power tubes