143J

Overview

The Hammond Manufacturing 143J is an audio transformer designed for chassis mounting, belonging to the 143-146 series. It features a primary impedance of 3000 Ohms and a secondary impedance of 1000 Ohms with a center tap (C.T.). Rated for 30mW power handling, this component is engineered for general-purpose applications and serves as a replacement in push-pull tube output circuits.

Feature Summary

• Chassis mount construction
• Push-pull tube circuit compatibility
• Center-tapped secondary winding

Applications

• Push-pull tube output circuits
• General-purpose audio driver applications
• Replacement in vintage audio equipment

Procurement Notes

Verify the specific impedance configuration matches the target circuit requirements before procurement. Confirm that the 30mW power rating is sufficient for the intended application load. Ensure chassis mounting provisions align with the installation panel specifications to guarantee secure physical integration.

Selection Notes

Select this model when a 3000:1000 CT impedance ratio is required for low-power audio stages. It is suitable for designs utilizing push-pull vacuum tube configurations. Consider the chassis mount form factor if space constraints preclude PCB mounting alternatives within the enclosure design.

Part Context

This component is part of the Hammond Manufacturing 143-146 series of audio transformers. The series provides standardized impedance ratios for audio signal coupling. The 143J specifically addresses needs for small-signal driver applications requiring precise impedance matching between tube stages.

Replacement Considerations

Confirm that substitute components maintain the identical 3000 Ohm primary and 1000 Ohm center-tapped secondary impedance values. Verify that the replacement unit supports the same 30mW power rating to prevent thermal overload or signal distortion in the existing circuit topology.