1642SE

Overview

The Hammond Manufacturing 1642SE is a single-ended tube audio output transformer designed for high-fidelity applications. It features a primary impedance of 5000 Ohms and supports secondary impedances of 4, 8, and 16 Ohms. The unit handles a power level of 75W with a frequency response of 20Hz to 20kHz. Key electrical specifications include an inductance of 53H, DC current of 300mA, and isolation voltage of 3500Vrms. Physical dimensions are 7.500 inches long by 4.380 inches wide, with a maximum height of 5.250 inches.

Feature Summary

• Single-ended configuration optimized for tube amplifier output stages
• Multi-tap secondary winding supporting 4, 8, and 16 Ohm loads
• High-voltage isolation capability for safety and signal integrity
• Shielded construction to minimize electromagnetic interference

Applications

• High-fidelity (Hi-Fi) tube audio amplifiers
• Guitar amplifier output stages
• Professional audio equipment requiring low distortion
• Custom tube driver or interstage circuits

Procurement Notes

Verify the specific secondary impedance requirement (4, 8, or 16 Ohms) matches the target speaker load before ordering. Confirm that the 75W power rating and 5000 Ohm primary impedance align with the vacuum tube characteristics. Ensure physical mounting space accommodates the specified dimensions and weight. Check for any regional shipping restrictions due to the component's mass.

Selection Notes

Select this model for single-ended tube designs requiring a 5k primary impedance. It is suitable for applications demanding a 75W power handling capacity. Consider the physical size constraints as it is a base-mount component. Compare against push-pull alternatives if the circuit topology requires balanced outputs. Verify compatibility with the intended tube type regarding DC current limits.

Part Context

This component belongs to the Hammond Classic Audio Transformers series, which specializes in magnetics for tube-based audio systems. The 1642SE represents a standard single-ended output solution within this portfolio. It complements other Hammond transformers like the 1638SEA, though it lacks certain tap configurations found in different series models. It is part of a lineage of proven audio engineering products.

Replacement Considerations

The 1638SEA is a related single-ended model but may differ in specific impedance or power ratings. Direct substitutes require matching 5k primary, 75W power, and compatible secondary taps. Verify pinout and mounting hole patterns when considering alternative manufacturers' equivalents.