125D

Overview

The Hammond Manufacturing 125D is an audio transformer designed for universal push-pull tube output applications with a 3-watt power rating. It features a single channel configuration and utilizes terminal connections. The device operates within a frequency range of 150 Hz to 15 kHz, providing an inductance of 14.94 H. Electrical specifications include a primary coil impedance of 25 kOhms and a secondary coil impedance of 15 Ohms. The unit is unshielded and measures 2.06 inches in length, 1.25 inches in width, and 1.19 inches in height.

Feature Summary

• Designed for universal push-pull tube output circuits
• Supports 3-watt power handling capacity
• Features terminal end type connections

Applications

• Tube amplifier output stages
• Audio signal transformation
• Push-pull circuit implementation

Procurement Notes

Verify the specific datasheet version for the 125D model to confirm electrical tolerances and physical dimensions prior to integration. Ensure compatibility with existing tube output configurations regarding impedance matching. Confirm that the unshielded design meets electromagnetic interference requirements for the intended enclosure environment.

Selection Notes

Select this component when designing audio systems requiring a dedicated push-pull output transformer. Consider the 25 kOhm primary impedance for proper tube load matching. Evaluate the need for shielding if the application is sensitive to external magnetic fields, as this model is unshielded.

Part Context

The 125D belongs to the Hammond Manufacturing 125A-125E series of audio transformers. This series is engineered for high-fidelity audio applications involving vacuum tube technology. The components are characterized by robust construction suitable for fixed rail mounting in professional audio equipment.

Replacement Considerations

Public confirmed substitute part numbers: None.