811 vs. 572 tubes

Transmitting Line Condition vs. SWR Table - One another useful Table for the HAM's practice.

G5RV vs. Ground Plane on 80M - Comparison tests by WF7T of a G5RV antenna vs a GP antenna on 80 meters band

PAC-12 Antenna - mobile multiband  ^pop - Here’s an award-winning, easy-to-homebrew, multi-band portable vertical antenna designed by long-time antenna aficionado James Bennett, KA5DVS. He’s documented the design and construction plans for a portable antenna that can be built with relatively ordinary components

PAC-12 Vertical portable antenna - Build the PAC-12 Antenna a multi-band portable vertical designed by KA5DVS, here’s an award-winning, easy-to-homebrew, multi-band portable vertical antenna designed by long-time antenna aficionado James Bennett, KA5DVS. He’s documented the design and construction plans for a portable antenna

Stone Vintage Radio - Antique Radios, Wireless, Crystal Sets, Tubes, and Valves - Stone vintage radio describes early radio from marconi to the 1960s. its covers antique radio, wireless, tubes, valves, crystal sets, and battery radios. included in the virtual museum are hundreds of pictures, images, and descriptions of antique radios, articles, faq, sell, and buy a radio.

C&H Distributing - A stocking electronics distributor. Electronic tubes, military components, asset recovery program, coax and connectors

Penninger Radio - The home of the TIPPER a portable base system & the CLAMP-IT series of mast clamps & the SNAP TUBES series of snap together mast tubes, Snap Tube Joiner, Guy Slip Ring.

HA1YA Mechanics & Electronics Inc. - Specializes in manufacture of middle and high power RF decks and high quality linear amplifiers with metall ceramic tubes for HF, 6m, 2m and 70 cm bands. Transverters, power supplies and control units

Discovery Power Amplifiers - The Discovery series of amplifiers are designed and built in the UK by Linear Amp UK Ltd, one of the world’s leading amplifier manufacturers, specializing in high power RF tube amplifiers. The amplifiers use large GS31 or GS35 ceramic triode tubes. Band coverage 6m, 2m and 70 cms

Penninger Radio - Mast clamps, tipping bases, roof mounts, tire mount, masts, series of snap together mast tubes.

The Mast Company - Telescopic fiberglass poles, tubes, special products for Amateur Radio stations suitable for ARES / RACES and other public service applications

House Of Tubes - High-quality brand name tubes ideal for use in audio amplifiers and ham radio equipment at low prices, including used and hard to find tubes.

Econco - Leader in providing power vacuum tubes. A subsidiary of CPI

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

BURLE Industries - Power tubes, high voltage power supplies

Icom IC-718 vs. FT-990 or IC-781 - Forum thread about IC-718 compared vs Yaesu FT 990 and Icom IC-781

Yaesu FTDX-5000 Manual Part 1 - FTDX-5000 Operating manual part 1

Vacuum Tube Supply - Sell New old stock vacuum tubes at discount prices

Radio Tubes, NOS Vacuum Tubes on sale - Old Radio, Ham Radio, NOS Audio, Antique TV Tubes on sale

BEIJING ELJVT - Sell the China made electron tubes over a long period of time, the vacuum tubes/electron valves/Power tubes/Audio Tubes/Thyratrons/Magnetrons and accessories, the tube sockets, the vacuum capacitors, high voltage ceramic capacitors, aluminum electrolytic capacitor.

glfer - glfer is a program for reception and transmission of QRSS/DFCW signals. It is composed of two main parts: the spectrogram window, where you can see the spectrum of the received signal vs. time the transmission functions, to emit cw characters at a slow but precisely controlled speed, using the QRSS (slow CW) or DFCW (Dual Frequency CW) modes

Duncan's Amp Pages - This is an internet resource for those interested in guitar amplifiers, vacuum tubes, and design tools such as SPICE modelling.

HL1INF RF Amplifiers - Circuits, pictures and data about toroids, tubes and home made power amplifiers

Hight voltage power supply - High Voltage Supply for GS 35B Amplifier

Vacuum tube Basics - Here's a tale of early '70s vacuum tubes, mainly from the viewpoint of amateur radio.