1 | The driver used the dial mounted on the dash to control the flow of air into the vacuum chamber. | |
2 | In semiconductor receivers transistors take the place of vacuum tubes. | |
3 | It's a small plastic bucket with a crotch cup and a vacuum. | |
4 | There were computers before the transistor; they used vacuum tubes as logic elements. | |
5 | According to the company, the large and heavy vacuum tube-based traveling wave tube amplifiers cannot be effectively replaced by GaAs transistors because they a much lower breakdown voltage |