Hammond Manufacturing 804 Audio Transformer Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 804 is a broadcast quality audio transformer designed for chassis mount applications. It features 500/125/125 ohm impedance configuration on both primary and secondary windings, operating across the 50Hz to 15kHz audio frequency range with ±0.5dB frequency response. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations where this transformer specification remains applicable.

Substiute Parts

804

Hammond ManufacturingIn Stock: 937804 Datasheet

Current PartRFQ

804A

Hammond ManufacturingIn Stock: 802804A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Hammond Manufacturing 804 is determined by the following critical parameters:

• Impedance Configuration: Primary and secondary impedance values must match 500/125/125 ohms
• Frequency Range: Operating range must cover 50Hz to 15kHz minimum
• Frequency Response: ±0.5dB specification must be maintained
• Transformer Type: Broadcast quality or impedance matching classification
• Mounting Type: Chassis mount configuration required
• Power Level: 15dB specification
• Compliance: ROHS3 compliance and EAR99 ECCN classification

The Hammond Manufacturing 804A qualifies as a direct substitute based on matching impedance configuration, frequency range, frequency response, power level, mounting type, and regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

The Hammond Manufacturing 804A serves as the active production equivalent for the obsolete Hammond 804. Both components maintain identical impedance specifications, frequency range, and frequency response characteristics required for audio transformer applications in the 50Hz to 15kHz band.

Key considerations for selection:

• Termination Compatibility: The 804A uses wire leads termination versus the 804's solder lug configuration. Circuit board layout and connection methodology must accommodate this difference.
• Physical Dimensions: The 804A has a reduced seated height of 1.250" compared to the 804's 2.559", affecting enclosure space requirements and mounting clearance.
• Regulatory Compliance: Both parts maintain ROHS3 compliance and EAR99 ECCN classification, ensuring equivalent environmental and export regulatory status.
• Product Availability: The 804A is active production status with current inventory, whereas the 804 is obsolete with limited remaining stock.

Frequently Asked Questions (FAQ)

Q: Can the Hammond 804A directly replace the Hammond 804 in existing designs?

A: The 804A matches all critical electrical parameters including impedance, frequency range, and frequency response. However, termination style differs (wire leads versus solder lug), requiring circuit board connection method adjustment. Physical height reduction must be verified against enclosure constraints.

Q: What impedance values define compatibility for this transformer category?

A: Substitute transformers must maintain the 500/125/125 ohm impedance configuration on both primary and secondary windings. Impedance matching is the primary electrical criterion for substitution.

Q: Are there frequency response limitations when substituting the 804?

A: The substitute must maintain ±0.5dB frequency response across the 50Hz to 15kHz operating range. This specification is non-negotiable for audio transformer applications requiring broadcast quality performance.

Q: Does the termination style change affect electrical performance?

A: Termination style (solder lug versus wire leads) is a mechanical interface consideration only. Electrical performance remains equivalent when proper connection methodology is implemented.

Q: What is the significance of the transformer type designation change from Broadcast Quality to Impedance Matching?

A: Both designations indicate the transformer's functional purpose. The 804A's impedance matching classification confirms its suitability for the same 500/125/125 ohm impedance transformation application as the original 804.

Q: Are compliance certifications equivalent between the two parts?

A: Yes. Both the 804 and 804A maintain ROHS3 compliance and EAR99 ECCN classification, ensuring equivalent regulatory status for environmental and export purposes.