146J

Overview

The Hammond Manufacturing 146J is a chassis-mount audio transformer designed for general-purpose and replacement use in push-pull tube output circuits. It features a primary impedance of 1000 CT ohms with a DC resistance of 4.4 ohms, and a secondary impedance of 3.2 ohms with a DC resistance of 700 milliohms. The unit operates within a frequency range of 150Hz to 15kHz with a response accuracy of ±1dB. Rated at 700mW power level, it utilizes wire lead termination and measures 1.630 inches in length, 0.880 inches in width, and has a maximum installation height of 0.810 inches.

Feature Summary

• Engineered specifically for integration into push-pull tube output circuit configurations
• Provides balanced center-tapped primary winding architecture for signal symmetry
• Supports direct chassis mounting via wire lead connections for secure physical attachment

Applications

• Push-pull tube amplifier output stages
• Audio signal coupling in vintage equipment restoration
• General-purpose audio transformer replacement applications

Procurement Notes

Verify the specific impedance configuration matches the original circuit requirements before procurement. Confirm that the chassis mounting dimensions align with the existing enclosure layout. Ensure the power handling capacity meets the operational demands of the target application. Check for compliance with relevant environmental regulations such as RoHS standards if required by the project specifications.

Selection Notes

Select this component when replacing failed units in push-pull tube amplifiers requiring a 1000 CT primary impedance. Consider the physical dimensions and wire lead termination style for compatibility with the existing assembly. Evaluate the frequency response characteristics to ensure they meet the audio bandwidth requirements of the system design without introducing phase anomalies.

Part Context

This component belongs to the 143-146 series of low-profile audio transformers manufactured by Hammond Manufacturing. These units are characterized by their economic open construction and chassis mount form factor. The series provides standardized solutions for audio coupling tasks where specific impedance ratios and frequency responses are critical for maintaining signal integrity in tube-based electronic systems.

Replacement Considerations

Direct substitute part numbers are not explicitly confirmed in public documentation. Verify electrical equivalence regarding impedance ratios and power ratings when selecting alternatives.