290MAX

Power Transformers Overview

The Hammond Manufacturing 290MAX is a power transformer designed for tube guitar amplifiers, specifically serving as a replacement for Vox models. It operates at a primary voltage of 115VAC and features a single primary winding. The secondary configuration includes a center-tapped output rated at 660VAC with a current capacity of 276mA. Additional secondary outputs provide 6.3V at 4A and 5V at 3A. The unit utilizes wire lead termination and is intended for chassis mounting.

Power Transformers Feature Summary

• Designed as a direct replacement for Vox guitar amplifier power transformers
• Features a single primary winding for standard AC input compatibility
• Provides multiple secondary voltages to support tube rectification and heater circuits

Power Transformers Applications

• Replacement in Vox tube guitar amplifiers
• Custom tube audio amplifier builds requiring specific secondary configurations
• Restoration of vintage Vox amplifier equipment

Power Transformers Procurement Notes

Verify the specific Vox amplifier model compatibility before purchase, as the 290 series contains variants tailored to different manufacturers. Confirm that the existing chassis dimensions can accommodate the transformer's physical footprint. Ensure the wiring harness matches the wire lead termination style. Check local electrical standards regarding the 115VAC primary rating to ensure safe operation within your region's power grid specifications.

Power Transformers Selection Notes

Select this component when replacing a failed transformer in a Vox amplifier or building a custom amp requiring its specific voltage taps. Compare the 290MAX against other 290 series units like the 290TX or 291EX to ensure the secondary currents and voltages match the circuit design. Consider the physical size constraints of the amplifier chassis during selection.

Power Transformers Part Context

The 290MAX belongs to Hammond Manufacturing's 290 Series, a line of laminated core power transformers widely used in tube audio applications. This series is known for providing reliable replacements for original equipment manufacturer (OEM) transformers from major guitar amplifier brands. The 290MAX specifically targets the Vox brand ecosystem, offering standardized dimensions and electrical characteristics compatible with their classic designs.