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Product Detailed Parameters
- Description：XFMR 4.3KCT / 4, 8, 16 CHAS MNT
- Series：A
- Mfr：Hammond Manufacturing
- Package：Box
- Mounting Type：Chassis Mount
- Size / Dimension：4.250" L x 3.130" W (107.95mm x 79.50mm)
- Height - Seated (Max)：3.810" (96.77mm)
- Termination Style：Wire Leads
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：4.3kCT
- Impedance - Secondary (Ohms)：4, 8, 16
- DC Resistance (DCR) - Primary：37.19Ohm, 42.17Ohm
- DC Resistance (DCR) - Secondary：244mOhm, 377mOhm, 490mOhm
- Transformer Type：Push-Pull Audiophile, Ultra-Linear - Tube Output
- Frequency Range：30Hz ~ 30kHz
- Frequency Response：±1dB
- Voltage - Isolation：2000V @ 1 Second
- Insertion Loss：-
- Return Loss：-
- Power Level：60W
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 1650NA is a shielded push-pull audio output transformer designed for tube amplifier circuits. It features a primary impedance of 4,300 ohms center-tapped with a maximum DC current rating of 318 mA. The secondary winding provides selectable impedances of 4, 8, and 16 ohms. Rated at 60 watts, the unit operates within a frequency range of 30 Hz to 30 kHz. It utilizes an enclosed chassis mount configuration with four mounting slots.
Feature Summary
- Push-pull topology optimized for tube output stages
- Enclosed shielding design to minimize electromagnetic interference
- Multi-tap secondary winding supporting multiple speaker impedances
- Chassis mounting structure with four-slot installation
Applications
- High-fidelity vacuum tube audio amplifiers
- Push-pull output stage construction
- Professional audio equipment manufacturing
- Custom tube amplifier restoration projects
Procurement Notes
Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm that the received unit matches the specific 1650NA designation regarding primary impedance and power rating. Inspect physical condition for shipping damage. Ensure compliance with relevant safety standards for audio isolation transformers before integration into final assemblies.
Selection Notes
Select this model when designing push-pull tube circuits requiring a 4,300-ohm primary impedance. The 60-watt power rating suits medium-power amplifier applications. Verify compatibility with target speaker loads across the 4, 8, and 16-ohm secondary options. Consider the enclosed chassis form factor for mechanical integration and shielding requirements in the final enclosure design.
Part Context
This component belongs to the Hammond 1650 series of audio transformers, which includes variants such as the 1650E, 1650PP, and 1650HA. These units share similar push-pull architectures but differ in primary impedance, power handling, and mounting configurations. The 1650NA specifically addresses designs requiring 4,300-ohm primary impedance with a 60-watt capacity.
Replacement Considerations
Direct substitutes include other Hammond 1650 series models with matching electrical specifications. Verify primary impedance and power ratings before cross-referencing with alternative manufacturers' offerings. Ensure mechanical dimensions and mounting styles align with existing chassis layouts.
