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290JDX is listed in the Power Transformers range at ChipApex. The manufacturer field lists Hammond Manufacturing. Its product description is Tools/Equipment/Hardware. Review the specifications below when checking this part for your BOM.
Power Transformers specifications for 290JDX
- Description：Tools/Equipment/Hardware
- Series：290
- Mfr：Hammond Manufacturing
- Package：Bulk
- Type：-
- Voltage - Primary：-
- Voltage - Secondary (Full Load)：-
- Current - Output (Max)：-
- Primary Winding(s)：Single
- Secondary Winding(s)：Single
- Center Tap：Yes
- Power - Max：-
- Mounting Type：Chassis Mount
- Termination Style：Wire Leads
- Size / Dimension：-
- Height - Seated (Max)：-
- Voltage - Isolation：-
- Weight：-
Power Transformers datasheet and documents for 290JDX
Power Transformers Overview
The Hammond Manufacturing 290JDX is a laminated chassis-mount power transformer designed for tube guitar amplifier applications, specifically the Marshall DSL-401. It features a single primary winding rated for 230 VAC input and triple secondary windings providing 307V CT at 215mA, 6.7V at 3.5A, and 25V at 75mA. The unit has a 92 VA power rating, operates at 50/60 Hz, and utilizes wire lead termination.
Power Transformers Feature Summary
- Triple secondary winding configuration optimized for tube amplifier bias and heater circuits
- Chassis mounting style with wire lead connections for direct integration
- Single primary winding design supporting standard mains voltage inputs
Power Transformers Applications
- Marshall DSL-401 guitar amplifier replacement
- Tube guitar amplifier power supply reconstruction
- High-fidelity audio equipment requiring specific high-voltage rectification
Power Transformers Procurement Notes
Verify that the replacement unit matches the original transformer's physical dimensions and terminal layout to ensure proper fit within the amplifier chassis. Confirm that the secondary voltage ratings and current capacities align with the circuit design requirements before installation. Check for any mechanical modifications needed for mounting holes or lead lengths.
Power Transformers Selection Notes
Select this model when replacing a failed transformer in amplifiers requiring a 92 VA rating with specific high-voltage and low-voltage secondary outputs. Ensure the new unit supports the required input voltage range and frequency. Consider the physical size constraints of the equipment enclosure and the availability of compatible wiring harnesses for the wire lead terminations.
Power Transformers Part Context
This component belongs to the Hammond 290 series, a line of power transformers widely used in vintage and modern tube audio equipment. The series is known for providing reliable power conversion for vacuum tube circuits, offering various configurations to match different amplifier designs and power requirements.
Power Transformers Replacement Considerations
Direct substitute part numbers are not explicitly confirmed in public documentation. Verify compatibility by comparing electrical specifications and physical dimensions with the original equipment manufacturer's parts list.
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