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3000 page mega website for Radio Amateurs, builders, radio broadcasters, manufacturers and individuals around the world. We cover any RF part you can think of from vacuum capacitors to rf connectors to transmitting doorknob caps to roller inductors.

A great source for hard to find HI END & power tubes & sockets, various capacitors, vacuum relays, various keys and paddles.

The Collins TRC-75 autotune linear amplifier, owned by JF2SVU, is presented with a focus on its internal modifications. This QRO amplifier utilizes three 4CX250 tubes in parallel for its final stage, delivering 1 KW output power. Notably, the amplifier achieves full power with only 100 mW of RF input, a characteristic often associated with Collins designs. The original 400 Hz power supply has been converted for easier shack integration, and the entire RF and power supply sections have been rehoused into a compact, clean enclosure. The control unit, positioned above the amplifier, features three meters for individual vacuum tube IP monitoring and a multi-meter on the right. A dedicated 7 MHz receiver, recently completed, is also part of this integrated system. The autotune functionality means the main amplifier unit only requires connections for power, control, and coaxial cables, simplifying its operation. Key components like the 4CX250 tubes and NF capacitors are visible, along with the gearing mechanism for the final tank circuit. A timer and relay system manages high-voltage delay and cooling fan off-delay, although the cooling fan's airflow is noted as somewhat insufficient. A central volume control, which experienced a contact issue, is also highlighted.

Svetlana tubes also Russian capacitors,vacuum and coaxial relay, for RF Power Linear Amplifier builders. Amateur-Radio, Broadcast. Full Online Catalog.

Manufacturer & distributor of Vacuum tubes and vacuum capacitors.

Supplying over 2000 different vacuum tube types, valves, grid caps, sockets and capacitors. It is easy for Antique collectors, Ham radio operators, audio enthusiasts, broadcast enthusiasts and amateur radio hobbyists to buy, sell and trade vacuum tubes, electron tubes, audio tubes, valves, grid caps, sockets and capacitors

Air conditioning soft copper tubes are perfect for loop construction. If you want to try a loop you must have an air variable capacitor or a vacuum variable capacitor. Article by PY1AHD

Penta Laboratories is a Manufacturer and Distributor of vacuum tubes, capacitors and electron tubes for Broadcast, Industrial, Marine and Avionics applications worldwide.

K8CU technical topics article about high voltage breakdown tester necessary for testing of any high voltage components like vacuum tubes, high voltage capacitors, vacuum relay

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

Amateur radio loop antenna project using a Comet CVBA-500BC vacuum variable capacitor.

GREENSTONE USA leader in the Vacuum Industry manufacturing products such as Vacuum Tubes, Vacuum Capacitor, Vacuum Relays, Vacuum Contactors and Vacuum Interrupters.