INTRODUCTION The Type 79-02A Amplifier is a dual-channel amplifier and is provided with two basic amplifier sensitivities and bandwidths for XI and X10 calibrated operation as follows: 100 millivolts/division sensitivity with a dc to 100 megacycle bandwidth. 10 millivolts/division sensitivity with a dc to 90 megacycle bandwidth. - Operation of this plug-in unit enables the user to obtain two vertical signals on the screen simultaneously or to display either channel individually. The VARIABLE gain control, located concentrically with the VOLTS/DIV switch, has a range of greater than 2-1/2 to 1. This VARIABLE gain control provides continuous overlap between steps of the attenuator (VOLTS/DIV) switch. A detented stop position is provided when the VARIABLE gain control is set to CAL. A MODE switch is provided which enables the selection of either Channel 1 or Channel 2 for separate display or the combination of both channels for dual display. In addition, ALTernate or CHOPped modes of operation are available. Use of the Polarity Inversion switch may give Channel 1 minus Channel 2 or Channel 2 minus Channel 1 presentation when MODE switch is set to ADDED. The Type 79-02A Amplifier is intended for use in the Y cavity of the Type 766H/F Series Oscilloscopes. 2. FEATURES •100 Me bandwidth at 100 mv/div sensitivity •10 mv/div sensitivity with 90 Me bandwidth •Solid state circuitry •Cascading feature converts instrument from dual trace to a high-gain, single trace unit; 1 mv/div sensitivity with 30 Me bandwidth nominal. FEATURES (concluded) • Front-panel GAIN ADJ control is provided for each channel to normalize gain between channels • Polarity Inversion switch enables subtraction of two signals when operating in the Added mode • Ground position on Input Selector switch provides ground reference on base line without necessity of grounding input of instrument • Provides equivalent dual-beam scope operation when : used with Fairchild Type 74-17A Automatic Display Time Base Plug-in unit ;