The service manual for the Hallicrafters Model S-38 provides detailed instructions for setting up and operating the 6-tube AC/DC superheterodyne radio receiver, including information on band selection, tuning, and control settings for preliminary test operations. Additionally, it includes troubleshooting guidance such as dial cord restringing procedures, alignment instructions, and voltage measurements at tube terminals to assist with maintenance and repair.

• Brand: Hallicrafters
• Model: NO.2-2
• Type: service manual
• File size: 582.5 KB

Manual Overview

The service manual for the Hallicrafters Model S-38 radio receiver provides detailed instructions for troubleshooting, diagnostics, and adjustments. The Model S-38 is a 6-tube AC/DC superheterodyne receiver with four AM/CW bands. The manual outlines the power supply requirements, tube types, and their functions, which include mixing, amplification, detection, and power rectification. Troubleshooting guidance includes checking tube voltages and ensuring correct control settings, such as volume, band selector, and tuning, for preliminary tests. The manual provides specific alignment instructions for each band, emphasizing the use of standard signal generators and adjustments of trimmers and padders for optimal performance. Dial cord restringing procedures are detailed for both main tuning and bandspread tuning, requiring precise measurements and tension adjustments. The manual also includes a schematic diagram for board-level repairs and a list of resistor and capacitor values for component-level troubleshooting.

Quick Issues Covered

• Diagnose power-up failures with voltage checks at tube terminals.
• Calibrate IF frequency to 455 kc for optimal performance.
• Use schematics for circuit tracing and component identification.

Overview

Model S-38 is a 6-tube AC/DC superheterodyne table model radio receiver. It incorporates 4 bands of AM/CW reception, covering frequencies from 540 kc to 32.0 mc. The receiver includes features such as AVC, noise limiting, BFO pitch, headset reception, standby operation, and bandspreading. The rear panel has connections for a line cord, antenna, ground, and headset. It operates on 105 to 125 volts AC/DC with a power drain of 30 watts. The manual provides detailed service information, including tube types and functions, control settings, and instructions for restringing dial cords.

Specifications

• Model S-38 is a 6 tube AC DC superheterodyne radio receiver.
• 4 bands of AM/CW reception.
• Band #1: 540 kc to 1650 kc.
• Band #2: 1650 kc to 5.0 mc.
• Band #3: 5.0 mc to 14.5 mc.
• Band #4: 13.5 mc 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 volts AC, DC line voltage.
• Power drain: 30 watts.
• Tube types and function: 12SA7—mixer-oscillator; 12SK7—IF amplifier; 12SQ7GT—detector, AVC, audio amplifier; 35L6GT—audio power amplifier; 12SQ7GT—BFO and ANL; 35Z5GT—power rectifier for AC operation.
• IF frequency: 455 kc.
• IF selectivity: 7 kc wide at 6 db down, 65 kc wide at 60 db down.
• Image ratio: 2.7:1 at 30 mc, 6:1 at 14 mc, 10:1 at 5 mc, 35:1 at 1500 kc.
• Sensitivity: 12 microvolt at 600 kc, 12 microvolt at 5 mc, 11 microvolt at 14 mc, 23 microvolt at 30 mc.
• Audio output: 675 milliwatt with less than 10% distortion at 400 cycles (for 50 milliwatt output).

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 connections for a line cord, antenna and ground connector strip, and a headset connector plug strip. The power supply requires 105 to 125 volts AC/DC and has a power drain of 30 watts. The control settings for preliminary test operation include standby set to “RECEIVE,” volume adjusted as necessary, band selector set to “1,” speaker/phones switch set to “SPEAKER,” CW/AM BFO switch set to “AM,” noise limiter set to “OFF,” main tuning set to local station frequency, and band spread set to “0.”

Troubleshooting & Error Codes

Refer to the PDF for details.

Safety & Warnings

Refer to the PDF for details.

Download NO.2-2 Service manual (PDF – 582.5 KB)

Service manual for Hallicrafters S-38 NO.2-2; assists technicians in troubleshooting and calibrating radio components. PDF size: 582.5 KB.

• Brand: Hallicrafters-s-38-service-bulletin
• Model: NO.2-2
• Type: Service manual
• File size: 582.5 KB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download NO.2-2 service manual (PDF)