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Product Detailed Parameters
- Description：AUDIO XFMR 4.2KCT / 4 CHAS MNT
- Series：1750
- Mfr：Hammond Manufacturing
- Package：Box
- Mounting Type：Chassis Mount
- Size / Dimension：4.050" L x 3.050" W (102.87mm x 77.47mm)
- Height - Seated (Max)：3.523" (89.48mm)
- Termination Style：Wire Leads
- Turns Ratio - Primary:Secondary：31.16:1
- Impedance - Primary (Ohms)：4.2kCT
- Impedance - Secondary (Ohms)：4
- DC Resistance (DCR) - Primary：46.48Ohm, 51.04Ohm
- DC Resistance (DCR) - Secondary：170mOhm
- Transformer Type：Push-Pull Audiophile, Ultra-Linear - Tube Output
- Frequency Range：70Hz ~ 15kHz
- Frequency Response：±1dB
- Voltage - Isolation：-
- Insertion Loss：-
- Return Loss：-
- Power Level：60W
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 1750L is a tube application power transformer designed for guitar amplifier output stages. It features a push-pull configuration with a primary impedance of 4,200 Ohms center-tapped and a secondary impedance of 4 Ohms. The unit supports a power rating of 60W and operates within a frequency range of 70 Hz to 15 kHz. Constructed with wire lead termination, this single-channel audio transformer is built for chassis mounting in high-fidelity audio equipment.
Feature Summary
- Designed as a drop-in replacement for original factory units to preserve stock tone characteristics
- Constructed to physically resemble original factory components where possible
- Utilizes specific material specifications and design parameters consistent with vintage amplifier requirements
Applications
- Fender Bassman Head amplifiers
- Tube guitar amplifier output stages
- High-fidelity audio reconstruction projects
Procurement Notes
Verify the specific impedance and wattage ratings against the target amplifier schematic before installation. Confirm that the chassis mounting dimensions and wire lead configurations match the existing enclosure layout. Ensure the new transformer meets the thermal and electrical requirements of the vacuum tube circuitry to prevent performance degradation or component failure.
Selection Notes
Select this model specifically for Fender Bassman Head applications requiring a 4-Ohm secondary load. The 4,200 Ohms center-tapped primary matches the plate-to-plate impedance of the intended tube pair. Consider the physical footprint and weight when designing the amplifier chassis to ensure adequate support and vibration isolation for optimal acoustic performance.
Part Context
This component belongs to the Hammond 1750 Series, a line of audio transformers engineered for tube guitar amplifier replacements. The series focuses on maintaining the tonal integrity of classic American amplifier designs while providing reliable modern manufacturing standards. These transformers are widely recognized in the restoration community for their accurate replication of historical electrical characteristics.
Replacement Considerations
Direct substitute part numbers include the 1750A, 1750AX, and 1750B variants, which share similar physical form factors and application contexts within the same product family.
