CONTENTS
Page Preface …………………—-—-—————-——-—————-———-————-— 2
Electrical and Physical Specifications-—-—-————-——-——————----———-—— 5
Introduction ——————-----—---——-——----——-——-———---—-————-—-—- 6
PART I—INSTALLATION
Antenna (Indoor or Outdoor)-----..—- 7 Shields —————---—-—-….——---———-- 7
Ground ------------------------------------ 7 Batteries —————--—-———-———----— 7
PART II—SERVICE DATA
Antenna System Failures----.-—------------- 7 Adjusting R. F. Line-up Condensers--------- 7
Radiotron Sockets and Prongs----------.----- 7 Service Data on Reproducer Unit-------..----- 7
Broken Condenser Drive Cord— ——----- 7 Service Data Charts—--——-————….— 8-9
PART HI—ELECTRICAL TESTS
Testing Condensers ——------—------—---- 10
Socket Voltages Radiola 21 or 22---—------ 10
Voltage Readings -—-—-——--—.——.— 10
Radiola 21 or 22 Continuity Tests-—------- 11
Continuity Test Charts ————— 13-15
PART IV—MAKING REPLACEMENTS
Removing Chassis from Cabinet of Radiola 21 16
Removing Reproducer from Radiola 22-—--- 16
Removing Receiver Assembly from Radiola 22 16
Replacing R.F. Line-up Condensers- -———
16
ILLUSTRATIONS
RCA
Radiola 21 ------------------------------------- 1
Schematic Circuit Diagram of Radiolas 21 and
Rear Interior Cabinet View of Radiola 22 ----- 4
22 Receivers-----------------------------------—--——----— 11
Top View of Receiver Chassis------------------ 5
Sub-Chassis View of Receiver------------------ 6
Rear view with shields removed ------------------ 7
Radiola 22 Battery Cable and External Connections ---- 12
Internal Connections of A.P. Coupling Unit---- 10
Wiring Diagram and Color Code-—--------------- -——— 14
3
