108P

Overview

The Hammond Manufacturing 108P is an audio output transformer designed for general-purpose and replacement applications in push-pull tube output circuits. It features a center-tapped primary winding with an impedance of 10,000 ohms and two center-tapped secondary windings, each providing an impedance of 1,500 ohms. This component facilitates signal coupling in vacuum tube amplifier stages, ensuring proper impedance matching between the tube plate circuits and the subsequent load or speaker transformer.

Feature Summary

• Center-tapped primary winding configuration
• Dual center-tapped secondary windings
• Designed for push-pull tube output circuits

Applications

• Push-pull tube audio output circuits
• Vacuum tube amplifier replacement
• General-purpose audio signal coupling

Procurement Notes

Verify the specific impedance ratings (10K CT / 1.5K CT) against the original circuit requirements to ensure compatibility. Confirm that the physical mounting style matches the existing chassis layout. Check for any variations in lead wire length or insulation type if replacing older units. Ensure the new unit meets the thermal and electrical specifications of the intended application.

Selection Notes

Select this transformer when a 10,000-ohm center-tapped primary and dual 1,500-ohm center-tapped secondaries are required. It is suitable for standard push-pull tube amplifier designs. Consider physical dimensions and mounting hardware availability during selection. Verify that the frequency response characteristics meet the audio bandwidth requirements of the system.

Part Context

This component belongs to Hammond Manufacturing's line of audio transformers, specifically engineered for tube-based audio equipment. The 108P model serves as a direct replacement or design-in option for vintage and modern tube amplifiers requiring specific impedance ratios for optimal power transfer and signal fidelity in output stages.