GENERAL DESCRIPTION... 3 INSTALLATION ... 4 2.1 CAUTION 2.2 Unpacking and Tube Installation 2.3 Power Connection 2.4 Antenna Connection 2.5 ALC Connection 2.6 Exciter Requirements 2.7 Exciter Connections 2.8 RF Exciter Connection (Transceiver) 2.9 RF Exciter Connection (Separate Transmitter and Receiver With External Antenna Transfer Relay) 2.10 RF Exciter Connection (Separate Transmitter and Receiver Without External Antenna Transfer Relay) 2.11 Relay Connection 2.12 Ground Connection OPERATION... 8 3.1 Explanation of Controls 3.2 Preliminary Adjustment 3.3 CW Tune-Up Procedure 3.4 SSB Tune-Up Procedure 3.5 AM Tune-Up Procedure THEORY OF OPERATION ... 12 4.1 Class of Operation 4.2 Grid Bias Supply 4.3 Input Circuit 4.4 ALC 4.5 Output Circuit 4.6 Metering 4.7 Primary Power Circuits 4.8 CW-SSB Mode Selection 4.9 Antenna and Transmit — Standby Switching 4.10 Cut-Off Bias i SERVICE INSTRUCTIONS... 15 5.1 Tube Replacement 5.2 Filter Capacitor Board Removal 5.3 Cabinet Removal 5.4 Front Panel and Side Gusset Removal 5.5 Regulator Transistor Change 5.6 Air System Cleaning 5.7 Grid Resistor Tap Change i TROUBLE SHOOTING... 17 1 PARTS LIST