1650PP

Overview

The Hammond Manufacturing 1650PP is a push-pull tube audio output transformer designed for general-purpose and replacement use in tube output circuits. It features a primary impedance of 6.6kCT and secondary taps for 4, 8, and 16 Ohms. The unit operates within a frequency range of 30Hz to 30kHz with a power rating of 60W. It includes 40% screen taps for ultra-linear operation and offers a frequency response of ±1dB. The transformer is enclosed in a drawn steel case, completely potted in epoxy, and utilizes bottom-mounted lugs for lead connections.

Feature Summary

• Enclosed in a drawn steel case and completely potted in epoxy for shielding and durability
• Includes 40% screen taps to support ultra-linear operation configurations
• Features bottom-mounted lugs for secure lead connections
• Designed specifically for push-pull tube output circuits

Applications

• Push-pull tube output circuits
• Hi-fi audio amplifier replacements
• General-purpose tube application transformers

Procurement Notes

Verify part status as the 1650PP is listed as obsolete by the manufacturer. Confirm availability through authorized distributors or surplus channels. Ensure compatibility with existing chassis mounting requirements and wiring specifications before procurement. Check for alternative active series parts if long-term supply stability is required.

Selection Notes

Select this component for applications requiring a 6.6kCT primary impedance with 4, 8, and 16 Ohm secondary options. It is suitable for designs needing 60W power handling and ultra-linear tap capabilities. Consider its physical dimensions and lug termination style when integrating into existing chassis layouts. Verify that the enclosed, potted construction meets environmental protection needs.

Part Context

The 1650PP belongs to the Hammond 1600 series of audio transformers. It is an enclosed, shielded unit intended for tube amplifier output stages. The series is known for providing ample bass headroom and high-quality magnetics. This specific model is part of a line that includes various impedance and power ratings for different tube configurations.

Replacement Considerations

The 1650HA is a related active product in the 1608A series with similar 6.6kCT primary impedance and 4/8/16 Ohm secondary taps. However, the 1650HA has a 40W rating and base-mount installation, differing from the 1650PP's 60W rating and lug connections. Verify electrical and mechanical compatibility before substitution.