1. The common-emitter circuit is the most widely used of junction, transistor amplifiers . 2. A transistor amplifier is an example of this kind of network. 3. In contrast, modern transistor amplifiers can have very low output impedance, enabling lower-impedance headphones. 4. The influence of the speaker impedance is different between tube amplifiers and transistor amplifiers . 5. For several years, Gibson continued to use ROs in transistor amplifiers for the tremolo effect. 6. All the controls were analog circuits utilizing Burr-Brown transistor amplifier modules and other analog components. 7. Some earlier attempts include a one-transistor amplifier in 1966. 8. In 1969 more transistor amplifiers were introduced, including the'Zodiac'series and the behemoth'Super Showman System '. 9. These supplies were unregulated, a practice which continues to this day in transistor amplifier designs. 10. During his early career Santana used a GMT transistor amplifier stack and a silverface Fender Twin.