1650F

Overview

The Hammond Manufacturing 1650F is a shielded audio output transformer designed for tube application power circuits. It features a push-pull configuration with a primary impedance of 7,600 center-tapped ohms and supports secondary impedances of 4, 8, and 16 ohms. The unit has a power rating of 25W and operates within a frequency range of 30 Hz to 30 kHz. Electrical specifications include a maximum DC current of 128 mA. Physical dimensions are 2.5 inches in height, 3.25 inches in width, and 3.06 inches in length. The component utilizes terminal end connections and is packaged in bulk.

Feature Summary

• Push-pull topology optimized for tube amplifier output stages
• Shielded construction to minimize electromagnetic interference
• Multi-tap secondary winding supporting 4, 8, and 16 ohm loads

Applications

• Tube-based audio power amplifiers
• Hi-Fi audio signal processing equipment
• Professional audio output stage integration

Procurement Notes

Verify the specific pinout configuration and terminal orientation against the official datasheet before integration. Confirm that the 7,600 CT primary impedance matches the intended vacuum tube plate requirements. Ensure the physical mounting space accommodates the specified dimensions of 2.5 x 3.25 x 3.06 inches. Check for compliance with local environmental regulations regarding RoHS status as indicated in the manufacturer documentation.

Selection Notes

Select this model when a 25W push-pull output transformer is required for tube applications. The 7,600 CT primary impedance is critical for matching specific tube types. Choose this variant over others if terminal connections are preferred over wire leads. Consider the 30 Hz to 30 kHz frequency response for standard audio fidelity requirements. Verify that the 128 mA maximum DC current rating exceeds the circuit's operational demands.

Part Context

The 1650F belongs to the Hammond 1608A-1650A series of audio transformers. This series provides various power ratings and impedance configurations for tube amplifier designs. The 1650F specifically addresses mid-range power requirements with a 25W rating. It shares design characteristics with other models in the series but differs in primary impedance and power handling capabilities.

Replacement Considerations

The 1650E serves as a lower-power alternative with an 8,000 CT primary and 15W rating. The 1650PP offers a 6.6kCT primary with a 60W rating but is discontinued. The 1650HA provides a chassis-mount option with a 6.6kCT primary and 40W rating. Verify impedance compatibility before substituting any of these variants.