Johnson Viking Valiant Schematic Diagram
Diagram Description
This document presents a detailed schematic diagram for the Johnson Viking Valiant transmitter. It illustrates the complex interconnections of various electronic components, including vacuum tubes, resistors, capacitors, inductors, transformers, and switches, organized into functional blocks.
Key Functional Blocks
- VFO (Variable Frequency Oscillator): The core frequency generation unit.
- Crystal Oscillator Buffer: Provides a stable frequency reference.
- Multiplier: Stages for frequency multiplication.
- Final Amplifier: The power amplification stage for the RF signal.
- Clamper: Circuitry for signal shaping or protection.
- Modulator: Stages responsible for modulating the carrier wave.
- Audio Amplifier Stages (First, Second, Third): Amplification of the audio input signal.
- Audio Driver: Drives the final audio output stage.
- HV Rectifier Stages: High voltage rectification for power supply.
- LV Rectifier Stage: Low voltage rectification for power supply.
- Bias Rectifier Stage: Rectification for bias voltages.
- RF Bias: Bias control for RF stages.
- Modulator Bias: Bias control for the modulator.
- Keyer: Circuitry for keying the transmitter.
- Meter: For monitoring various circuit parameters.
- Antenna Relay Jack: Connection point for antenna relay.
Component Notes
- All switches are viewed from the knob end, with wafers lettered A, B, etc., from the knob end toward the rear of the switch.
- All switches are shown in their extreme counter-clockwise position.
- Resistors are in Ohms unless otherwise specified.
- Capacitors are in micromicrofarads (μμF) unless otherwise specified.
Power Supply and Control
- HV Rectifier: Utilizes 5U4GB tubes (V18, V19) for high voltage rectification, supplied by transformer T3.
- LV Rectifier: Uses a 5V4GA tube (V20) for low voltage rectification, supplied by transformer T5.
- Bias Rectifier: Employs a 5U4GB tube (V21) for bias rectification, supplied by transformer T5.
- PTT Relay (RY1): A relay likely used for Push-To-Talk functionality.
- SW1-SW8: Various switches controlling different functions and band selections.
- J1-J7: Jack connections for various inputs and outputs (e.g., Keyer, RF Output, Mike, Phone-Patch, Antenna Relay Jack).
- F1-F3: Fuses for circuit protection.
Vacuum Tube Complement
The transmitter utilizes a variety of vacuum tubes, including:
- V1, V2, V3, V4, V5, V6, V7, V8, V10, V11, V12, V13, V14, V15, V16, V17, V18, V19, V20, V21
- Specific tube types mentioned include 6CL6, OA2, 5763, 6146, 6AQ5, 12AU7, OC3 (VR-105), 12AX7, 6AL5, 6C4, 5U4GB, 5V4GA.
Revision Information
The schematic is marked with a revision date of 9-10-58.
