The service manual for the Hallicrafters Model S-38 provides detailed instructions for setup, operation, and troubleshooting of the 6-tube AC/DC superheterodyne radio receiver, including information on band selection, control settings, and dial cord restringing. It also includes specifications for power supply, tube types, and replacement parts, ensuring proper maintenance and repair of the device.
Manual Overview
The Hallicrafters Model S-38 service manual provides detailed guidance for technicians working on this 6-tube AC/DC superheterodyne radio receiver. The manual emphasizes troubleshooting procedures, starting with checking the power supply voltage range of 105 to 125 volts and ensuring a power drain of 30 watts. It outlines the function of each tube, including the 12SA7 mixer-oscillator and the 35Z5GT power rectifier. For diagnostics, the intermediate frequency is set at 455 kHz, with sensitivity and image ratio specifications provided for various bands. Calibration involves adjusting the tuning capacitor and ensuring proper dial cord restringing, with specific instructions for both main and bandspread tuning. The manual includes a comprehensive parts list, detailing capacitors, transformers, and resistors, with part numbers for replacements. Technicians are advised to follow the control settings for preliminary test operations and to use the provided diagrams for accurate component placement and adjustments.
Quick Issues Covered
- Diagnose power-up failures with AC/DC line voltage checks.
- Calibrate IF frequency to 455 kHz for optimal sensitivity.
- Use schematics for circuit tracing and troubleshooting.
Overview
Model S-38 is a 6-tube AC/DC superheterodyne table model radio receiver. It features 4 bands of AM/CW reception with frequency ranges from 540 kc to 32.0 mc. The receiver includes provisions for AVC, noise limiting, BFO pitch, headset reception, standby operation, and bandspreading. The rear panel has connections for a line cord, antenna and ground connector strip, and a headset connector plug strip. It operates on 105 to 125 volts AC/DC with a power drain of 30 watts.
Specifications
- Model S-38 is a 6 tube AC DC superheterodyne table model radio receiver.
- Incorporates 4 bands of AM CW reception:
- – Band 1: 540 ke to 1650 kc
- – Band 2: 1650 ke to 3.0 me
- – Band 3: 3.0 me to 14.5 mc
- – Band 4: 14.3 me to 32.0 mc
- Provision for AVC, noise limiting, BFO pitch, headset reception, standby operation, and bandspreading.
- Rear panel connections: line cord with plug, antenna and ground connector strip, headset connector plug strip.
- Power supply data: 105 to 125 solis AC DC line voltage, power drain is 30 watts.
- Tube types and function:
- – 12SA7: mixer-oscillator
- – 12SK7: IF amplifier
- – 12SQ7G: detector, AVC, audio amplifier
- – 35L6GT: audio power amplifier
- – 12SQ7GI: BFO and ANL
- – 35Z5GT: power rectifier for AC operation
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
Model S-38 is a 6-tube AC/DC superheterodyne table model radio receiver with 4 bands of AM CW reception. It includes features such as AVC, noise limiting, BFO pitch, headset reception, standby operation, and bandspreading. The rear panel has a line cord with a plug, an antenna and ground connector strip, and a headset connector plug strip. The power supply operates on 105 to 125 volts AC/DC line voltage with a power drain of 30 watts. The control settings for preliminary test operation include standby, volume, band selector, pitch control, speaker output, BFO, noise limiter, tuning, and bandspread.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download NO.2 Service manual (PDF – 569.2 KB)
Hallicrafters S-38 Service Bulletin No.2 PDF helps technicians troubleshoot and calibrate the S-38 radio model. File size: 569.2 KB.
- Brand: Hallicrafters-s-38-service-bulletin
- Model: NO.2
- Type: Service manual
- File size: 569.2 KB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Download NO.2 service manual (PDF)
Hallicrafters S-38 Service Bulletin NO.2 – Service Manual Overview
The Hallicrafters S-38 is a classic shortwave communications receiver renowned for its reliability and performance in amateur radio and general shortwave listening. Designed in the mid-20th century, this receiver covers a wide range of frequencies, allowing users to tune into international broadcasts, amateur radio transmissions, and other radio signals with clarity and precision. The Service Bulletin NO.2 provides essential servicing instructions and technical details to maintain and optimize the S-38’s operation.
Main Features and Specifications
- Frequency Coverage: 540 kHz to 30 MHz across multiple bands
- Superheterodyne receiver design for improved selectivity and sensitivity
- Multiple tuning bands with calibrated dials for precise frequency selection
- Built-in BFO (Beat Frequency Oscillator) for CW and SSB reception
- Audio output suitable for headphones or external speakers
- Robust analog circuitry with vacuum tube components
Basic Usage and Operation Tips
To operate the Hallicrafters S-38, first select the appropriate band switch position corresponding to the desired frequency range. Use the main tuning dial to locate the station, and fine-tune with the vernier control for optimal clarity. Engage the BFO switch when listening to Morse code (CW) or single sideband (SSB) transmissions. Adjust the volume and tone controls to suit listening preferences. Always allow the receiver to warm up for a few minutes before use to ensure stable performance.
Troubleshooting and Maintenance Notes
Common issues with the S-38 include tube wear, alignment drift, and capacitor degradation. Regularly inspect vacuum tubes and replace any that show signs of failure or weak emission. The service manual provides detailed alignment procedures to recalibrate the receiver for peak sensitivity and selectivity. Clean all controls and switches periodically to prevent static and poor connections. If audio output is weak or distorted, check speaker connections and tubes associated with the audio amplifier stage.
Safety Reminder
When servicing the Hallicrafters S-38, always disconnect the power supply before opening the chassis to avoid electric shock. Use caution when handling vacuum tubes as they can become hot during operation. Follow proper grounding procedures and use insulated tools to prevent injury or damage to the equipment.