290DAX

Power Transformers Overview

The Hammond Manufacturing 290DAX is a laminated core power transformer designed for tube guitar amplifier applications. It features dual primary windings supporting 120V and 240V inputs at 50/60 Hz frequencies. The secondary configuration provides a high voltage output of 710V or 610V center-tapped at 230mA, alongside filament supplies of 6.3V center-tapped at 5A and 5V at 3A. This chassis-mount unit utilizes wire leads for termination and is engineered to replace generic Fender power transformers in vintage-style audio equipment.

Power Transformers Feature Summary

• Dual primary winding design accommodates both 120V and 240V input voltages for global compatibility
• Triple secondary winding structure delivers high voltage plate supply and dedicated filament outputs
• Chassis mounting style with wire lead termination facilitates integration into open-frame amplifier designs

Power Transformers Applications

• Replacement for generic Fender tube guitar amplifiers
• Restoration of vintage tube audio equipment
• Custom tube amplifier builds requiring specific voltage tap configurations

Power Transformers Procurement Notes

Verify the specific input voltage requirement (120V vs 240V) against the target amplifier's wiring before installation. Confirm that the secondary current ratings meet the vacuum tube specifications of the intended circuit. Ensure the chassis mounting dimensions align with the existing enclosure cutouts. Cross-reference the part number with official Hammond Manufacturing documentation to confirm compatibility with the specific amplifier model being serviced.

Power Transformers Selection Notes

Select this component when replacing failed power transformers in tube amplifiers that require a 710Vct or 610Vct high voltage supply. The dual primary feature allows selection based on regional line voltage availability without changing the transformer itself. Consider the physical dimensions and wire lead length when designing new chassis layouts. Ensure the filament current capabilities match the total draw of the tubes in the signal chain.

Power Transformers Part Context

The 290DAX belongs to the Hammond 290 Series, a collection of power transformers specifically engineered for musical instrument amplification. This series is characterized by its use in classic American tube amplifier designs. The 290DAX variant serves as a direct functional substitute for original equipment manufacturer parts used in Fender-style circuits, maintaining the electrical characteristics required for proper biasing and operation of vacuum tubes.

Power Transformers Replacement Considerations

The 290DEX is a related variant within the same series offering different secondary voltage taps. Verify that the 290DAX matches the exact voltage requirements of the target amplifier, as other models in the 290 series may have differing secondary configurations.