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Product Detailed Parameters
- Description：XFMR 5KCT / 4, 8, 16, 70V CHAS
- Series：A
- Mfr：Hammond Manufacturing
- Package：Box
- Mounting Type：Chassis Mount
- Size / Dimension：3.750" L x 2.500" W (95.25mm x 63.50mm)
- Height - Seated (Max)：3.060" (77.72mm)
- Termination Style：Wire Leads
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：5kCT
- Impedance - Secondary (Ohms)：4, 8, 16, 70V
- DC Resistance (DCR) - Primary：72.11Ohm, 79.35Ohm
- DC Resistance (DCR) - Secondary：276mOhm, 391mOhm, 464mOhm, 9.304Ohm
- 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：30W
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 1645A is a shielded push-pull audio output transformer designed for tube amplifier applications. It features a single channel with a primary impedance of 5,000 ohms center-tapped and a secondary impedance of 16 ohms. The unit supports a power rating of 30 watts and operates within a frequency range of 30 Hz to 30 kHz. Electrical specifications include a primary current of 128 mA and secondary taps at 4, 8, and 16 ohms. Physical dimensions are 3.75 inches in length, 2.5 inches in width, and 3.06 inches in height, with wire lead termination.
Feature Summary
- Push-pull configuration optimized for tube audio output stages
- Shielded construction to minimize electromagnetic interference
- Multiple secondary voltage taps for flexible load matching
Applications
- Tube amplifier output stages
- General-purpose audio signal transformation
- Replacement components in vintage audio equipment
Procurement Notes
Verify the specific series designation when sourcing replacements, as Hammond offers various models within the 1608A-1650A family. Confirm that the required primary impedance matches 5,000 ohms center-tapped and the secondary configuration aligns with 4-8-16 ohm taps. Ensure the physical envelope dimensions fit the existing chassis layout. Cross-reference the manufacturer part number against official datasheets to avoid confusion with similar series items.
Selection Notes
Select this component based on its specific 30-watt power handling capability and defined frequency response range. The choice depends on compatibility with the target tube circuit's impedance requirements and the necessity for a shielded design to maintain signal integrity. Consider the wire lead termination style for integration into the existing wiring harness without requiring additional connectors.
Part Context
This transformer belongs to the 1608A-1650A series produced by Hammond Manufacturing. The series focuses on providing reliable audio and signal transformation solutions for specialized electronic applications. The 1645A model specifically addresses the needs of push-pull tube circuits, offering standardized electrical parameters within a robust physical package suitable for industrial and consumer audio hardware.
Replacement Considerations
Direct substitutes within the same series may exist; verify exact electrical equivalence before installation.
FAQ
What is the primary impedance specification?
The primary impedance is 5,000 ohms with a center tap.
Does the transformer include shielding?
Yes, the unit is fully shielded to reduce noise.
