290JX

Power Transformers Overview

The Hammond Manufacturing 290JX is an industrial power transformer designed for tube guitar amplifier applications, specifically replacing units in Marshall JCM 900-100 Watt models. It features a single primary winding rated for 120/240 VAC at 50/60 Hz. The secondary configuration provides a center-tapped output of 360V with a current rating of 450 mA. Constructed as a chassis-mount component with wire lead terminations, this laminated core transformer supports dual voltage input flexibility while delivering the specific high-voltage requirements necessary for vintage-style tube amplification circuits.

Power Transformers Feature Summary

• Dual voltage primary support for 120V and 240V AC inputs across 50Hz and 60Hz frequencies
• Center-tapped secondary winding optimized for high-voltage tube amplifier plate supply
• Chassis mounting style with wire leads for direct integration into amplifier enclosures

Power Transformers Applications

• Replacement power supply for Marshall JCM 900 100 Watt guitar amplifiers
• Restoration of vintage tube guitar amplifiers requiring specific high-voltage DC rectification
• Custom tube amplifier builds utilizing standard chassis-mount transformer form factors

Power Transformers Procurement Notes

Verify that the replacement unit matches the original transformer's physical dimensions and terminal layout to ensure compatibility with existing chassis cutouts and wiring harnesses. Confirm that the input voltage rating aligns with the regional power supply standards where the equipment will operate. Cross-reference the secondary voltage and current specifications against the amplifier's circuit design to prevent mismatched power delivery or potential damage to vacuum tubes.

Power Transformers Selection Notes

Select this model when a direct functional replacement is required for Marshall JCM 900 series amplifiers. Ensure the application requires a single primary winding with dual voltage capability rather than a fixed voltage variant. Consider the chassis-mount form factor and wire lead termination style if space constraints or existing wiring methods dictate these physical characteristics over PCB mount alternatives.

Power Transformers Part Context

This component belongs to the Hammond 290 series of industrial power transformers, which are widely utilized in audio equipment manufacturing. The series offers various configurations tailored for different tube amplifier power requirements. The 290JX specifically addresses the needs of high-gain solid-state preamp and tube power amp combinations found in professional rock and blues amplification gear.

Power Transformers Replacement Considerations

• 290TX