31. By 1998, the NAD 3020 had become the most well known and best-selling audio amplifier in history. 32. Valve audio amplifiers typically amplify the entire audio range between 20 Hz and 20 kHz or higher. 33. Most professional audio amplifiers also provide protection from overdriven signals, short circuits across the output, and excessive temperature. 34. The film editor may have a soundtrack on one gang, which can be read with an audio amplifier . 35. In the audio amplifiers the resistive load ( loudspeaker ) is coupled via a transformer to the amplifier. 36. :As regards audio amplifier power ratings, that is just the maximum rated power output for the speaker drive. 37. Beam tetrodes have remained in use until quite recently in power applications such as audio amplifiers and radio transmitters. 38. The blue box consisted of a set of audio oscillators, a telephone keypad, an audio amplifier and telephone operators. 39. Two 833A's are capable of approximately 800 watts sine wave power in a class B audio amplifier or modulator. 40. The non-linear operating characteristic of the triode caused early tube audio amplifiers to exhibit harmonic distortion at low volumes.
