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Product Detailed Parameters
- Description：XFMR 4.25KCT / 4, 8 CHAS MNT
- Series：1750
- Mfr：Hammond Manufacturing
- Package：Bulk
- Mounting Type：Chassis Mount
- Size / Dimension：2.500" L x 3.150" W (63.50mm x 80.01mm)
- Height - Seated (Max)：3.319" (84.30mm)
- Termination Style：Wire Leads
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：4.25kCT
- Impedance - Secondary (Ohms)：4, 8
- DC Resistance (DCR) - Primary：82Ohm, 108.3Ohm
- DC Resistance (DCR) - Secondary：253mOhm, 462mOhm
- Transformer Type：-
- Frequency Range：70Hz ~ 15kHz
- Frequency Response：±1dB
- Voltage - Isolation：2000V @ 1 Second
- Insertion Loss：-
- Return Loss：-
- Power Level：40W
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 1750JA is a tube application power transformer designed for push-pull audio output circuits. It features a primary impedance of 4,250 ohms center-tapped and dual secondary windings rated at 8 ohms each. The unit supports a maximum power handling capacity of 40 watts with an operating frequency range spanning from 70 Hz to 15 kHz. Termination is achieved via wire leads, and the component is intended for chassis mounting in general-purpose audio amplifier applications.
Feature Summary
- Designed specifically for push-pull tube output circuits
- Features dual secondary windings for flexible impedance matching
- Supports high power handling up to 40 watts
Applications
- Tube guitar amplifier output stages
- General-purpose push-pull audio amplification
- Hi-Fi audio system output transformers
Procurement Notes
Verify the specific datasheet version to confirm exact electrical tolerances and physical dimensions before integration. Ensure that the wire lead termination style matches the existing circuit board or chassis wiring harness requirements. Cross-reference the 4,250-ohm center-tapped primary specification against the target amplifier design to guarantee proper impedance matching and optimal performance.
Selection Notes
Select this component when designing or repairing tube-based push-pull audio amplifiers requiring a 4,250-ohm center-tapped primary impedance. The dual 8-ohm secondary configuration allows for parallel or series speaker connections. Consider the 40-watt power rating and 70 Hz to 15 kHz frequency response to ensure compatibility with the intended audio signal bandwidth and power demands.
Part Context
This part belongs to the Hammond 1750 series of audio and signal transformers. The series includes various models tailored for different tube amplifier configurations, such as single-ended and push-pull topologies. The 1750JA variant is distinct within the lineup due to its specific 4,250-ohm center-tapped primary impedance and 40-watt power rating, catering to higher-power tube output applications.
Replacement Considerations
Direct substitutes include other Hammond 1750 series models with identical electrical specifications. Verify that any replacement maintains the 4,250-ohm center-tapped primary and dual 8-ohm secondary winding configuration. Ensure the physical footprint and wire lead lengths are compatible with the existing chassis mounting points.
