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Initially it was vacuum tubes, particularly the tetrode and pentode tubes, commonly used for amplification. These vacuum tubes provided the necessary gain and power handling capabilities required for VHF radio transmission. However, vacuum tubes were bulky, required high operating voltages, and were less efficient compared to later semiconductor technologies like the [MOSFET]. Despite these drawbacks, vacuum tubes were extensively used in radio transmitters until the advent of solid-state technologies. Initially it was vacuum tubes, particularly the tetrode and pentode tubes, commonly used for amplification in the VHF [[Radio Transmitter]]. These vacuum tubes provided the necessary gain and power handling capabilities required for VHF radio transmission. However, vacuum tubes were bulky, required high operating voltages, and were less efficient compared to later semiconductor technologies like the [[MOSFET]]. Despite these drawbacks, vacuum tubes were extensively used in radio transmitters until the advent of solid-state technologies. [[Category:Radio]][[Category:Micro Broadcasting]]