1609A

Overview

The Hammond Manufacturing 1609A is a push-pull tube audio output transformer designed for general-purpose and replacement use in tube amplifier circuits. It features an enclosed, shielded construction with four mounting slots for above-chassis installation. The unit delivers a power level of 10W, with a primary impedance of 10,000 Ohms center-tapped at 100 mA. The secondary winding provides selectable impedances of 4, 8, and 16 Ohms. It maintains a frequency response from 30 Hz to 30 kHz at full power.

Feature Summary

• Enclosed and shielded design to minimize electromagnetic interference
• Four-slot chassis mounting configuration for secure installation
• Center-tapped primary winding for push-pull circuit compatibility
• Multi-tap secondary winding supporting various speaker impedances

Applications

• Push-pull tube output circuits in high-fidelity audio amplifiers
• General-purpose tube amplifier reconstruction projects
• Replacement transformers for vintage audio equipment restoration

Procurement Notes

Verify the specific series designation when sourcing replacements, as Hammond offers multiple variants within the Tube Output category. Confirm that the physical dimensions and mounting hole patterns match the existing chassis layout. Ensure the primary current rating aligns with the amplifier's operational requirements to prevent component stress or failure during operation.

Selection Notes

Select this model specifically for push-pull configurations requiring a 10k ohm center-tapped primary. The inclusion of 4, 8, and 16 ohm secondary taps allows flexibility in matching different speaker loads without additional output transformers. Consider the enclosed shielding if the application is sensitive to magnetic interference from other internal components.

Part Context

This component belongs to the Hammond Manufacturing Tube Output series, which covers power levels ranging from 10 to 280 watts. The 1609A represents the entry-level option in this range, utilizing the Easy Wire Secondary design found in the 1608A-1650A series. This series is widely recognized in the audio industry for standardizing dimensions and electrical characteristics across various wattage classes.

Replacement Considerations

• 1608A
• 1610A

FAQ

What is the primary current rating for the 1609A?

The primary winding has a center-tapped current rating of 100 mA.

Does the 1609A include mounting hardware?

The datasheet specifies four mounting slots for chassis installation but does not explicitly list included screws or standoffs; verify accessory inclusion with the distributor.