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290LEX is listed in the Power Transformers range at ChipApex. The manufacturer field lists Hammond Manufacturing. Its product description is POWER TRANSFORMER, REPLACEMENT F. Review the specifications below when checking this part for your BOM.
Power Transformers specifications for 290LEX
- Description：POWER TRANSFORMER, REPLACEMENT F
- Series：290
- Mfr：Hammond Manufacturing
- Package：Bulk
- Type：-
- Voltage - Primary：-
- Voltage - Secondary (Full Load)：-
- Current - Output (Max)：-
- Primary Winding(s)：Single
- Secondary Winding(s)：Triple
- 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 290LEX
Power Transformers Overview
The Hammond Manufacturing 290LEX is a laminated core power transformer designed for tube guitar amplifier applications. It features a universal primary winding supporting 100, 120, 220, 230, and 240 VAC inputs at 50/60 Hz. The secondary configuration provides a 690V center-tapped high-voltage output rated at 200mA, alongside bias, filament, and heater windings delivering 6.3VCT at 5A and 5V at 3A. This unit utilizes chassis mounting with wire lead terminations.
Power Transformers Feature Summary
- Universal primary voltage compatibility for global operation across multiple standard AC frequencies
- Dedicated secondary windings optimized for vacuum tube rectification and heater circuits
- Robust laminated core construction ensuring stable power delivery in audio equipment
Power Transformers Applications
- Fender-style tube guitar amplifiers
- Marshall-style tube guitar amplifiers
- General-purpose tube audio power supply systems
Power Transformers Procurement Notes
Verify the specific input voltage requirements of the target amplifier chassis against the transformer's universal primary ratings. Confirm that the physical dimensions and terminal layout match the existing enclosure space. Ensure the secondary current ratings meet or exceed the circuit's maximum draw to prevent thermal overload during operation.
Power Transformers Selection Notes
Select this model when replacing transformers in vintage-style tube amplifiers requiring specific high-voltage and heater characteristics. Compare the secondary voltage and current specifications directly with the original component to maintain proper biasing and tube heating performance. Consider the chassis mounting style and lead termination type for mechanical integration.
Power Transformers Part Context
This component belongs to the Hammond 290 series, which specializes in power transformers for musical instrument amplification. The series includes variants tailored for different amplifier brands and topologies, such as the 290TX for Fender Bassman reissues and the 290PX for other configurations. Each part is engineered to replicate the electrical characteristics of classic amplifier designs.
Power Transformers Replacement Considerations
Direct substitutes include Hammond 290DEX for 240V primary applications and 290TX for specific Fender Bassman reissue builds. Verify that the replacement maintains the same secondary voltage and current ratings to ensure correct tube operation and amplifier tone.
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