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Product Detailed Parameters
- Description：XFMR 2.5K-10K / 4-32 CHAS MNT
- Series：125SE
- Mfr：Hammond Manufacturing
- Package：Box
- Mounting Type：Chassis Mount
- Size / Dimension：3.760" L x 2.520" W (95.50mm x 64.01mm)
- Height - Seated (Max)：3.150" (80.01mm)
- Termination Style：Solder Lug
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：2.5k ~ 10k
- Impedance - Secondary (Ohms)：4 ~ 32
- DC Resistance (DCR) - Primary：-
- DC Resistance (DCR) - Secondary：-
- Transformer Type：General Purpose
- Frequency Range：100Hz ~ 15kHz
- Frequency Response：±1dB
- Voltage - Isolation：-
- Insertion Loss：-
- Return Loss：-
- Power Level：20W
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 125FSE is a universal single-ended tube output audio transformer designed for high-fidelity audio applications. It features a primary impedance configuration of 2.5k, 5k, and 10k ohms, with secondary options of 4, 8, 16, and 32 ohms. The unit supports a power rating of 20 watts and operates within a frequency range of 100Hz to 15kHz. Key electrical specifications include an inductance of 10.5H and a maximum DC current of 90mA. The physical dimensions are approximately 123.8mm x 66.8mm x 79.5mm.
Feature Summary
- Universal single-ended tube output design
- Multiple primary and secondary impedance configurations
- High inductance for low-frequency response
Applications
- Tube amplifier output stages
- Hi-Fi audio signal transformation
- Custom audio equipment construction
Procurement Notes
Verify the specific impedance taps required for your circuit design against the available primary (2.5k/5k/10k) and secondary (4/8/16/32 ohm) options. Confirm that the 20W power rating and 90mA DC current limit align with your tube selection and operating conditions. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.
Selection Notes
Select this component when a versatile output transformer is needed for single-ended tube circuits. Ensure the chosen impedance matches the tube's plate-to-plate or plate-to-cathode requirements. Consider the physical size constraints given the 123.8mm length. Verify that the 100Hz lower frequency cutoff meets the bass response needs of the target audio system.
Part Context
This part belongs to Hammond Manufacturing's line of audio transformers, specifically tailored for vacuum tube electronics. It serves as a critical interface between the output tubes and the speaker load, ensuring proper impedance matching and signal fidelity. The product is distinct from general-purpose power transformers by its specialized audio frequency characteristics.
Replacement Considerations
The 125DSE and 125GSE are related models within the same series but offer different power ratings and current capabilities. The 125DSE provides 10W at 70mA, while the 125GSE offers 25W at 100mA. Verify that the alternative model's impedance ratios and physical dimensions are compatible with the existing enclosure and circuit layout before substitution.
