The amplifier and power supply are built to perform well for the long haul. Ads amplifiers hf amplifier legal limit 80, 40, 20. If cooled properly the tube can easily deliver over 2000 watts in grounded grid class ab2. The eimac 81643z is a compact power triode intended to be used as a zerobias classb amplifier in audio or radio frequency applications. Another rf amplifier that i like to build and slip into the 1947 collins 30k1 cabinet. Changing out the 833a for a 3z will give me about 1200 watts output for the same input power or about 11 db gain.
The bti lk2000 was originally a 3z based amplifier. Ive constructed rf power amplifiers since i started in amateur radio nearly 50. It is a directly heated cathode, like the 3 z so the tube is instant on, no waiting for the. The 3 400z, the 3 z, and the 3cx1500a78877 eimac triodes are perfect examples of clean linear amplification devices capable of running in the class.
A 4 can even be pressed into service if a 3 is not available. Includes metering panel for setting and monitoring line voltage and plate voltage, line circuit breaker, etc. It is a directly heated cathode, like the 3z so the tube is instant on, no waiting for the filament to heat up like the 8877. The eimac 3 z is a compact power triode designed for zero bias, class b r. Amperex is a leading brand of power grid tubes and magnetrons covering a wide range of. The 3cx1200 series and electrically similar 3z are lower gain tubes, even. There are several 4 tubes available, i prefer the fast warm up filaments used in these tubes. Power supply is disassembled consisting of motorized variac for setting hv, broadcast quality plate transformer, diode stack, swinging choke, and filter capacitors.
This will be the final update on this amplifier for a while. The 3z is a sweet tube that takes a great deal of punishment and keeps ticking along. This homebrew 2x 3 z grounded grid amplifier is designed for 4kw pep input for ssb service on the amateur bands between 1. The 3z8164 is primarily used in industrial applications. The cabinet contains the power supply, control circuits for. The amplifier is entirely free of regeneration or parasitics.
This homebrew 2x 3z grounded grid amplifier is designed for 4kw pep input for ssb service on the amateur bands between 1. The components need to stand up to 7,000 volts on the plate. Download foxfi wifi tether apk latest version for samsung, huawei, xiaomi, lg, htc, lenovo and all other android phones, tablets and devices. The amplifier uses a 3z triode to handle a third meter is a relative output indicator me. One of my favorite amplifier projects was the 4a and power supply. The american radio relay league arrl is the national association for amateur radio, connecting hams around the u. I plan to run between 5 and 6 kv in order to be able to drive the amp with less than 100 watts. This is a great hf amplifier, my all time favorite. It is a directly heated cathode, like the 3z so the tube is instant on, no waiting for the. It has been designed with ease of con struction and operation in mind, and to this end as few special parts and machine operations as possible are required. Part 1 of 2 converting a 833a rf amplifier to eimac 3z. I have built an 8877 amp for 144 mhz, four 811 amp for 8015, and work on other hf amps.
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