801A

Overview

The Hammond Manufacturing 801A is an isolated audio transformer designed for broadcast applications, specifically serving as an isolating and matching component. It operates within a frequency range of 50 Hz to 15 kHz. The primary winding offers selectable impedances of 50 Ohms or 200 Ohms, while the secondary winding provides corresponding 50 Ohm or 200 Ohm impedance options. The unit features shielded construction to minimize interference and supports a maximum DC current of 800 uA. Physically, it measures 44.5 mm in length, 31.8 mm in width, and 65 mm in height, with a weight of approximately 272.155 g.

Feature Summary

• Provides electrical isolation between circuit stages in broadcast audio systems
• Offers impedance matching capabilities for signal transmission integrity
• Features shielded construction to reduce electromagnetic interference

Applications

• Broadcast audio equipment signal isolation
• Push-pull tube output circuit replacement
• Audio system impedance matching

Procurement Notes

Verify the specific impedance configuration required for your application, as the 801A supports multiple primary and secondary impedance values (50/200 Ohms). Confirm that the maximum DC current rating of 800 uA aligns with your circuit's operational parameters. Ensure compatibility with existing chassis dimensions given the fixed physical footprint of 44.5 x 31.8 x 65 mm. Check for RoHS compliance requirements if applicable to your manufacturing standards.

Selection Notes

Select the 801A when designing or repairing broadcast audio circuits requiring galvanic isolation and precise impedance transformation. This model is suitable for general-purpose use where shielded performance is critical to maintain signal quality. Consider the physical size constraints and mounting style before integration. Compare against other series members like the 807A or 808A if different impedance ratios or current ratings are necessary for specific microphone or voice coil connections.

Part Context

The 801A belongs to the Hammond 800 series of audio transformers, which are engineered for professional broadcast and high-fidelity audio environments. This series emphasizes reliability and consistent performance across various audio frequencies. As part of Hammond Manufacturing's portfolio, these components are recognized for their robust shielding and durable encapsulation, ensuring long-term stability in demanding audio infrastructure applications.

Replacement Considerations

The 801A is explicitly noted for use as a replacement in push-pull tube output circuits. When substituting, ensure the new unit matches the original impedance specifications exactly to preserve circuit balance. Verify that the physical dimensions and lead configurations are compatible with the existing assembly to avoid mechanical modifications.