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Product Detailed Parameters
- Description：AUDIO XFMR 20K / 1KCT CHAS MNT
- Series：145
- Mfr：Hammond Manufacturing
- Package：Bulk
- Mounting Type：Chassis Mount
- Size / Dimension：1.630" L x 0.880" W (41.40mm x 22.35mm)
- Height - Seated (Max)：0.810" (20.57mm)
- Termination Style：Wire Leads
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：20k
- Impedance - Secondary (Ohms)：1kCT
- DC Resistance (DCR) - Primary：1.18kOhm
- DC Resistance (DCR) - Secondary：50Ohm
- Transformer Type：Economical Open Type
- Frequency Range：150Hz ~ 15kHz
- Frequency Response：±1dB
- Voltage - Isolation：-
- Insertion Loss：-
- Return Loss：-
- Power Level：135mW
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 145P is a chassis-mount audio transformer designed for push-pull tube output circuits. It features a primary impedance of 20,000 Ohms and a secondary impedance of 1,000 Ohms center-tapped (CT). The device operates within a frequency range of 150 Hz to 15 kHz. This component belongs to the 143-146 series and is intended for general-purpose applications requiring specific impedance matching in audio amplifier designs.
Feature Summary
- Designed specifically for push-pull tube output circuits
- Provides precise impedance transformation between primary and secondary windings
- Chassis mount construction for stable installation
Applications
- Push-pull tube audio amplifier output stages
- General-purpose audio signal coupling
- Audio equipment repair and replacement
Procurement Notes
Verify the exact impedance specifications match the circuit requirements before purchase. Confirm that the chassis mounting style fits the enclosure design. Ensure the frequency response range covers the intended audio bandwidth. Check datasheet details for thermal and electrical limits to prevent operational failure.
Selection Notes
Select this model when a 20k:1k CT impedance ratio is required for tube amplifiers. Consider the physical dimensions and mounting hole patterns for integration. Evaluate if the 150 Hz to 15 kHz frequency range meets the application's audio fidelity needs compared to broader-range alternatives.
Part Context
The 145P is part of Hammond Manufacturing's 143-146 series of audio transformers. These components are widely used in vintage and modern tube audio equipment. The series offers various impedance options to suit different tube types and circuit configurations.
Replacement Considerations
Direct substitutes must match the 20k:1k CT impedance ratio and chassis mount form factor. Verify compatibility with existing tube plate voltages and currents. Consult manufacturer cross-reference lists for equivalent models from other brands.
