CONTENTS
CRITICAL PRECAUTION DURING INSTALLATION
1
Section 1 INTRODUCTION
1
General Description of the ETO
91/3
Amplifier
1
Specifications, ETO
91/3
1
Figure 1 Top View
3
Section 2 PREPARING THE ETO
91fi
FOR OPERATION
4
Transformer Installation
4
Inspection of Tubes & Chimneys
4
AC Primary Connections & Amplifier Grounding
4
Operation from 90-130V mains
5
Figures 2-4 Transformer Installation
6
Section 3 AMPLIFIER/STATION INTERCONNECTIONS
7
Coaxial Cable Types & Connectors
7
T/R Control Cable
7
ALC
7
Figure 5 Back Panel
8
Section 4 OPERATION
9
4.1 Control Functions
9
4.2 Tune-up
9
1. Turning On the Amplifier
10
2. Tuning Up for Operation at 1,500 Watts RF Output
11
4.3 Reflected Power Protection
12
4.4 ALC
12
Section5 OPERATING AND MAINTENANCE NOTES
13
Tubes
13
Fuses
13
Electronic Bias Control
14
Plate Overcurrent Relay
14
Preventive Maintenance
14
Section 6 TROUBLESHOOTING HINTS
15
Section 7 DESIGN AND CIRCUIT OVERVIEW
17
SCHEMATICS
19
Summary of Contents for ETO 91B
Page 4: ...C21 C24 C20 C26 under Power Supply Board PS J1 J2...
Page 5: ...L4 BL1 HV Crowbar Vacuum Relay Power K2 Relays P1 XFMR T i S3 Interlock Figure 1 9ip Top View...
Page 10: ...FIGURE 5 91B REAR PANEL...
Page 22: ...91fi SCHEMATICS 19...
Page 25: ......
Page 26: ...B R E A K D 23 T G U N LO C K 10 M E TE R S FIGURE 7 91 CONTROL BOARD...
Page 28: ...FIGURE 8 91 S DISPLAY BOARD...
Page 29: ...er FIGURE 9 91 POWER SUPPLY BOARD...
Page 30: ...R13 J1 FIGURE 10 91 3 HV FILTER SCREEN SUPPLY...
Page 31: ...FIGURE 11 91 INPUT BOARD...
Page 32: ...FIGURE 12 91 OUTPUT RF WATTMETER FIGURE 13 91 MULTIMETER SWITCH...