description Heathkit SB-220 Overview
The Heathkit SB-220 is an amateur-radio linear amplifier sold as a build-it-yourself kit by Heathkit around the start of the 1970s. It is designed to increase the radio-frequency output of a compatible amateur transmitter on the high-frequency bands, and its power section uses two 3-500Z vacuum-tube triodes. The SB-220 is of interest to radio amateurs, restorers, and collectors of Heathkit equipment because its construction, high-voltage circuitry, and service history are part of maintaining a classic kit-built amplifier.
help Heathkit SB-220 FAQ
What is the Heathkit SB-220?
The SB-220 is a Heathkit amateur-radio HF linear amplifier kit from the 1960s. Its classic design uses two 3-500Z glass triodes to amplify a transmitter's radio-frequency output.
What does the SB-220 linear amplifier do?
It increases the RF power from a transceiver before transmission, rather than generating a separate signal by itself. The Heathkit SB-220 is known for its high-voltage tube amplifier circuit and high-power HF operation.
Why does a Heathkit SB-220 need a 220-volt supply?
Its power supply produces the high voltage required by the pair of 3-500Z tubes, so the amplifier was designed around 220-volt service. That makes it different from a simple low-voltage accessory and important to inspect before energizing.
What should be checked before operating an old SB-220?
A restorer should inspect the filter capacitors, high-voltage wiring, bleeder resistors, interlock, tubes, and ventilation. The SB-220 can retain dangerous voltage in its power supply even after it has been switched off.
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