The MIL TYPE 120B is a module that when attached to its amplifier/power supply, comprises the MIL TYPE 242 complete amplifier. Used with a separate power supply, the TYPE 120B is a complete preamplifier with balanced and unbalanced low impedance outputs that can be calibrated. The 120B reproduces for use with stereo the functions of the HHS Type 120A and it is designed to be incorporated into EIA systems with adaptors or with the 242 integration, as a part of any EIA system. The 242 is heat-philic, its chassis offering greater cooling capacity for its semiconductors than it uses in class A. Therefore, it can be used as a sink. The MIL TYPE 120B Equalizer - Preamplifier is a plug in module that matches the dimensions and the functions of the HHS TYPE 120A Equalizer - Preamplifier but is otherwise different and is designed to be used with a series of MIL devices that comprise the MIL System. The 120A is a solid state unit that is functionally similar but more comprehensive in function than the MIL TYPE 121 and 130 thermionic preamplifiers. The MIL TYPE 120B utilizes a phono plug in that can supply equalization for RIAA, NAB, or null. There are three types of integration, depending on functionality requirements, including an instance where the phono stage is omitted and some other device like a noise reduction circuit occupies the physical space. The primary phono circuit utilizes two transistors in a cascade circuit. A full function three transistor circuit that is cascade/cascode, similar to the HHS PC-P-5, or its MIL equivalent The tone driver is the HHS NC1-A2 or its MIL equivalent. The MIL TYPE 120B installs into an EIA docking station, the 242. A quasi-complementary amplifier, the MIL TYPE 242 develops a sine wave with a dissipation of five watts in Class A with both channels driven and develops a sine wave with a dissipation of fifteen watts in Class B.