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Product Detailed Parameters
- Description：XFMR 600 150/150 / 2.4K 600/600
- Series：148
- Mfr：Hammond Manufacturing
- Package：Bulk
- Mounting Type：Through Hole
- Size / Dimension：0.820" L x 0.680" W (20.83mm x 17.27mm)
- Height - Seated (Max)：0.690" (17.53mm)
- Termination Style：PC Pin
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：600, 150/150
- Impedance - Secondary (Ohms)：2.4k, 600/600
- DC Resistance (DCR) - Primary：45Ohm
- DC Resistance (DCR) - Secondary：300Ohm
- Transformer Type：Economical Open Type
- Frequency Range：200Hz ~ 15kHz
- Frequency Response：±1dB
- Voltage - Isolation：-
- Insertion Loss：0.5dB
- Return Loss：-
- Power Level：300mW
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 148A is an open-frame audio transformer designed for push-pull tube output circuits. It features a primary impedance of 2,400 ohms and dual secondary windings with 600-ohm impedances. The unit utilizes pin terminal connections for through-hole mounting on printed circuit boards. This component supports general-purpose audio signal transformation tasks requiring specific impedance matching for vacuum tube amplifier stages.
Feature Summary
- Designed specifically for push-pull tube output circuits
- Provides impedance matching between 2,400-ohm primary and 600-ohm secondaries
- Open-frame construction facilitates integration into custom chassis or PCB assemblies
Applications
- Push-pull tube audio output stages
- General-purpose audio signal transformation
- Vacuum tube amplifier replacement applications
Procurement Notes
Verify the exact datasheet specifications against the manufacturer's official documentation before procurement. Confirm that the pin configuration and physical dimensions align with the target circuit board layout. Ensure the operating environment remains within the thermal limits specified for open-frame transformers. Cross-reference the part number to distinguish it from similar models in the 148 series.
Selection Notes
Select this component when designing or repairing audio equipment utilizing push-pull tube configurations. The 2,400-ohm primary impedance must match the plate-to-plate load requirement of the output tubes. The dual 600-ohm secondaries are suitable for driving standard low-impedance speakers or subsequent transformer stages. Verify that the open-frame style fits within the available enclosure space without requiring additional shielding.
Part Context
The 148A belongs to Hammond Manufacturing's line of audio and signal transformers. These components are engineered for high-fidelity audio applications where precise impedance ratios are critical. The product line includes various impedance combinations tailored for different tube types and amplifier topologies, ensuring compatibility with vintage and modern tube-based audio designs.
Replacement Considerations
Direct substitutes may include other Hammond 148-series transformers with identical 2,400-ohm primary and 600-ohm secondary specifications. Verify pinout compatibility to ensure correct wiring during installation. Alternative brands may offer equivalent electrical characteristics but require validation of physical footprint and mounting hole patterns.
