The second amplifier is typically a power amplifier (power amp). The amplifier and speaker strengthen this signal using a power amplifier and a loudspeaker. An Overdrive Special amplifier with an internal Reverb Circuit. RF circuits are significantly different from broadband amplifier circuits. They connect to an amplifier like a normal subwoofer. The Rockman is a headphone guitar amplifier. Instead, solid-body instruments depend on electric pickups and an amplifier (or amp) and speaker. When connected to an electronic amplifier and loudspeaker, it worked. It is measured by connecting the electrodes to a voltage amplifier. They were powered by a 40 watt tube amplifier. MTX speaker drivers each powered by its own 1000-watt amplifier. Each player used one input of the same two-input Fender Champ amplifier. The fixed frequency simplifies optimization of the IF amplifier. Schmitt triggers are commonly implemented using an operational amplifier or a dedicated comparator. The "TPA" stands for "Transistor Phonograph Amplifier".