148T

Overview

The Hammond Manufacturing 148T is an open-frame audio transformer designed for printed circuit board mounting. It features a pin terminal interface with a primary impedance of 500 ohms and a center-tapped secondary impedance of 3.2 ohms. The component operates within a frequency range of 20 Hz to 20 kHz, supporting single-channel signal transmission. Its physical dimensions are approximately 0.82 inches in length, 0.68 inches in width, and 0.69 inches in height. This unit utilizes horizontal bracket construction for economical integration into audio driver circuits.

Feature Summary

• Open-frame design with horizontal bracket construction for economical assembly
• PC board mount configuration using pin terminals
• Single-channel audio signal transformation capability

Applications

• Audio driver stage coupling
• Signal transformer applications in audio equipment
• PC board mounted audio output stages

Procurement Notes

Verify the specific datasheet version for the 148T model to confirm exact electrical tolerances and thermal ratings before integration. Ensure that the receiving PCB footprint matches the specified pin terminal dimensions. Confirm compliance with relevant safety standards required for the final application environment. Cross-reference manufacturer documentation for any updates regarding material composition or RoHS status.

Selection Notes

Select the 148T when an open-frame, PC board mount audio transformer is required for low-cost driver applications. Consider its 500-ohm primary and 3.2-ohm secondary impedance match for specific tube or solid-state output stages. Evaluate the physical size constraints against the available board space. Compare performance characteristics with other models in the 148 series if different impedance ratios are needed.

Part Context

This component belongs to the Hammond Manufacturing 148 series of audio transformers. The series includes various models with different impedance ratios and winding configurations, such as the 148R and 148U variants. These units share a common open-frame construction style and pin-terminal mounting method, designed for versatile use in audio signal processing circuits requiring galvanic isolation and impedance matching.

Replacement Considerations

Direct substitutes within the same series include the 148R and 148U models, which offer alternative impedance ratios while maintaining similar form factors. Verify that any replacement part matches the required primary and secondary impedance values for the specific circuit design. Ensure mechanical compatibility with the existing PCB layout.