TM 11-2520: Dual Channel Amplifier AM-43/FRC | T.REX ARMS Field Manual Vault

TM 11-2520 Dual Channel Amplifier AM-43/FRC

TM 11-2520

Dual Channel Amplifier AM-43/FRC

Army · TM · Jan 1944 · 23 pages

About

RESTRICTED SECTION I DESCRIPTION 1. GENERAL. a. Purpose. Dual Channel Amplifier AM-43/FRC (fig. 1) is an audio-frequency amplifier designed to amplify two speechfrequency channels or tone circuits in the speech-frequency range. Low-level signals, which may pass undetected without the use of the amplifier, may be amplified by this unit to a usable volume. The amplifier is constructed so that both channels can be used simultaneously. This unit is designed primarily for amplification of low-level signals from telephone lines or other similar long transmission lines. It operates into a headset or loudspeaker circuit attached to the output terminals of each channel. b. Placement. The unit may be used wherever relay-rack facilities are available and there is a source of 110-120 volt a-c power. The amplifier is designed for operation with the vacuum tubes in a horizontal position. 2.

DesignationTM 11-2520

EditionJan 1944

StatusSuperseded

Pages23

FunctionComms Signal

CollectionHistoric

Public domain (U.S. Government work)