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Instruments, Technology

RCA Theremin Service Notes

By RCA Service Department -

Contents

Preface
Electrical and Physical Specifications
Introduction
Electrical Description of Circuits

PART I – SERVICE DATA

Installation
Normal Operation
Volume Control Adjustments
Pitch Adjustment Condenser
Range Below 1100 Cycles
Reversed Action of Pitch Control
High Pitched Note
Skip Effect in Pitch Control
Service Data Chart
S. P. U. Terminal Strip Voltages
Theremin Radiotron Socket Voltages
Methods for Continuity Tests
S. P. U. Continuity Tests
Main Assembly Continuity Test

PART II – MAKING REPLACEMENTS

Replacing Parts in the Theremin Assembly
Removal of Parts and Location of Cable

ILLUSTRATIONS

RCA Theremin
Rear Interior Cabinet View
Top Chassis View of the Main Assembly
Sub-chassis View of the Main Assembly
Schematic Circuit Diagram of the Main Assembly
Schematics Circuit Diagram of the Socket Power Unit
Complete Layout and Cable Connections
Wiring Diagram of the Socket Power Unit
Wiring Diagram of the Main Assembly
Internal Connections of Filter and By-Pass Condensers, and Filter Reactor

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