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Product Detailed Parameters
- Description：XFMR 7.6KCT / 4, 8, 16 CHAS MNT
- Series：A
- Mfr：Hammond Manufacturing
- Package：Box
- Mounting Type：Chassis Mount
- Size / Dimension：3.500" L x 2.500" W (88.90mm x 63.50mm)
- Height - Seated (Max)：3.060" (77.72mm)
- Termination Style：Wire Leads
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：7.6kCT
- Impedance - Secondary (Ohms)：4, 8, 16
- DC Resistance (DCR) - Primary：92.16Ohm, 102.8Ohm
- DC Resistance (DCR) - Secondary：210mOhm, 239mOhm, 309mOhm
- 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：25W
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 1650FA is a push-pull audio output transformer designed for tube amplifier circuits. It features a primary impedance of 7,600 CT with a maximum DC current of 128 mA and a secondary configuration supporting 4, 8, 16 Ohms and 70V taps. The unit has a power rating of 25W and operates within a frequency range of 30 Hz to 30 kHz. It utilizes terminal connections and includes shielding to minimize interference.
Feature Summary
- Designed specifically for push-pull tube output circuits to provide ample bass frequency headroom
- Includes shielding to reduce electromagnetic interference in sensitive audio applications
- Supports multiple secondary impedance options including standard speaker loads and line-level outputs
Applications
- Push-pull tube output stage integration
- High-fidelity audiophile amplifier construction
- Professional audio equipment signal transformation
Procurement Notes
Verify the specific secondary winding configuration required for your circuit design, as this model supports both low-impedance speaker taps and higher-impedance line outputs. Confirm that the physical dimensions and terminal spacing match your chassis layout before ordering. Ensure the primary impedance matches the vacuum tube plate-to-plate requirements exactly to maintain optimal performance and prevent damage.
Selection Notes
Select this component when designing push-pull tube amplifiers requiring a 25W power handling capacity and a 7,600 CT primary impedance. It is suitable for applications needing versatile secondary tap options including 70V distribution. Consider the physical weight and size constraints, as these units are engineered for heavy-duty bass response which impacts overall system mass.
Part Context
This transformer belongs to the Hammond Manufacturing series of audio and signal transformers. It is part of a family of components designed for high-performance tube audio applications. The product line emphasizes robust construction and electrical specifications tailored for vintage and modern hi-fi amplifier designs.
Replacement Considerations
The 1650E serves as a similar alternative but differs in power rating (15W) and primary impedance (8,000 CT). Verify compatibility carefully as impedance mismatches can affect tube operation. No direct pin-for-pin substitutes are documented; custom wiring adjustments may be necessary if replacing with different models.
