124E

Overview

The Hammond Manufacturing 124E is an audio transformer designed for tube driver and interstage applications in push-pull circuits. It features a power rating of 5 watts and utilizes grain-oriented steel construction. The unit operates within a frequency range of 150 Hz to 15 kHz with a ±1 dB response. Primary impedance is 10k ohms, while the secondary side offers a 90k CT configuration. Electrical isolation is rated at 500 Vrms. The component supports a turns ratio of 1:3 and employs wire lead termination for chassis mounting.

Feature Summary

• Designed specifically for tube driver and interstage roles in push-pull circuit architectures
• Utilizes grain-oriented steel core material for signal integrity
• Provides electrical isolation rated at 500 Vrms between windings

Applications

• Tube amplifier interstage coupling
• Push-pull output stage driver circuits
• Audio signal transformation requiring specific impedance matching

Procurement Notes

Verify the exact impedance configuration required for your circuit design, as the 124E specifies a 10k primary and 90k CT secondary. Confirm that the 5-watt power handling capacity aligns with your system's operational demands. Ensure compatibility with chassis mounting standards and verify that wire lead termination suits your assembly process. Cross-reference datasheet specifications against current production revisions to ensure functional equivalence.

Selection Notes

Select this component when designing vacuum tube audio stages requiring a 1:3 turns ratio and 5-watt capability. It is suitable for applications needing 10k primary impedance driving a 90k CT load. Consider its physical dimensions and chassis mount style during enclosure planning. Verify that the 150 Hz to 15 kHz frequency response meets the bandwidth requirements of the intended audio application without additional filtering.

Part Context

This component belongs to the Hammond 124 series of audio transformers, which are engineered for high-fidelity audio applications. The series typically includes variants with different impedance ratios and power ratings to suit various tube amplifier topologies. These units are characterized by their robust steel construction and precise electrical characteristics, making them standard choices for professional and enthusiast audio equipment manufacturing.

Replacement Considerations

The Hammond 124C serves as a related variant within the same series, featuring identical 10k primary and 90k CT secondary impedances but may differ in specific mechanical or minor electrical tolerances. Verify pinout and mounting hole patterns before substitution. No other direct cross-manufacturer equivalents are confirmed in public documentation.