Hammond Manufacturing 1627SE Audio Transformer Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 1627SE is a single-ended audiophile ultra-linear tube output transformer with 25kΩ primary impedance and selectable 4Ω, 8Ω, or 16Ω secondary impedance. Designed for chassis mount applications, this transformer operates across the full audio frequency range of 20Hz to 20kHz with ±1dB frequency response. The part is currently obsolete, making equivalent substitute parts necessary for ongoing maintenance, repair, and new design implementations where this impedance configuration is required.

Substiute Parts

1627SE

Hammond ManufacturingIn Stock: 10541627SE Datasheet

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1627SEA

Hammond ManufacturingIn Stock: 8421627SEA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1627SE is determined by the following critical parameters:

• Transformer Type: Must be Single Ended Audiophile, Ultra-Linear - Tube Output configuration
• Secondary Impedance Options: Must include 4Ω, 8Ω, and 16Ω selectable outputs
• Frequency Range: Must cover 20Hz – 20kHz minimum
• Mounting Configuration: Must support Chassis Mount installation
• Termination: Must use Wire Leads
• Series Compatibility: Hammond Manufacturing 1600 series preferred for form factor consistency

The 1627SEA qualifies as a direct substitute despite its different primary impedance (2.5kΩ vs. 25kΩ) because it maintains identical secondary impedance options, frequency response characteristics, mounting type, and termination style. The primary impedance difference reflects a different application class within the same transformer family, but the secondary-side electrical and mechanical compatibility remains complete.

Parameter Comparison

Engineering Selection Recommendations

The 1627SEA is the designated substitute for the obsolete 1627SE. Selection is based on the following engineering criteria:

Product Status: The 1627SE is obsolete with no ongoing manufacturing. The 1627SEA maintains active production status, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and hazardous substance directives.

Electrical Compatibility: Secondary-side impedance matching (4Ω, 8Ω, 16Ω) and frequency response characteristics (20Hz – 20kHz, ±1dB) are identical, ensuring load-side circuit compatibility.

Mechanical Compatibility: Chassis mount configuration, wire lead termination, and 1600 series form factor alignment enable direct mechanical substitution in existing designs.

Primary Impedance Consideration: The 1627SEA operates at 2.5kΩ primary impedance versus the 1627SE's 25kΩ. This difference requires source-side circuit evaluation to confirm impedance matching with the driving tube stage or output circuit.

Frequently Asked Questions (FAQ)

Q: Can the 1627SEA be used as a direct replacement for the 1627SE in all applications?

A: The 1627SEA provides complete secondary-side compatibility and mechanical interchangeability. However, the primary impedance difference (2.5kΩ vs. 25kΩ) requires circuit-level analysis. Applications must confirm that the driving source impedance is compatible with 2.5kΩ primary impedance to maintain proper impedance matching and frequency response.

Q: What is the significance of the different primary impedance values?

A: Primary impedance determines the input circuit loading and impedance matching characteristics. The 1627SE's 25kΩ primary is suited for high-impedance tube output stages, while the 1627SEA's 2.5kΩ primary is designed for lower-impedance sources. Selection depends on the driving circuit's output impedance specification.

Q: Are the physical dimensions compatible between these parts?

A: Both transformers are chassis mount with wire lead termination. The 1627SE measures 5.000" L × 3.750" W × 4.560" H, while the 1627SEA measures 4.500" L × 3.750" W × 4.560" H. The 1627SEA is slightly narrower, which may affect mounting bracket compatibility in space-constrained chassis designs.

Q: What is the power handling difference between these transformers?

A: The 1627SE is rated for 25W power level, while the 1627SEA is rated for 30W. The 1627SEA provides higher power capacity, making it suitable for applications requiring the 1627SE's electrical characteristics but with increased headroom.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). No compliance barriers exist for substitution from a regulatory standpoint.

Q: What packaging format is supplied with the 1627SEA?

A: The 1627SEA is supplied in box packaging, whereas the 1627SE packaging format is not specified in available documentation.