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Product Detailed Parameters
- Description：AUDIO XFMR CHAS MNT
- Series：290
- Mfr：Hammond Manufacturing
- Package：Bulk
- Mounting Type：Chassis Mount
- Size / Dimension：3.000" L x 2.500" W (76.20mm x 63.50mm)
- Height - Seated (Max)：2.013" (51.13mm)
- Termination Style：Wire Leads
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：-
- Impedance - Secondary (Ohms)：-
- DC Resistance (DCR) - Primary：8.03Ohm
- DC Resistance (DCR) - Secondary：140mOhm, 3.7Ohm, 40.72Ohm
- Transformer Type：-
- Frequency Range：-
- Frequency Response：-
- Voltage - Isolation：120/240VAC
- Insertion Loss：-
- Return Loss：-
- Power Level：-
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 290XX is a power transformer designed for tube guitar amplifier applications, specifically serving as a replacement for Fender Blues Jr. units. It features a single primary winding rated at 117 VAC and 60 Hz. The secondary configuration provides three outputs: 330V DC equivalent at 68mA, 20.5V AC, and 6.6V AC. This component utilizes wire lead termination and chassis mounting style, fitting within the 290 series industrial control transformers category.
Feature Summary
- Designed specifically for tube guitar amplifier circuits
- Provides multiple secondary voltage outputs for plate, heater, and bias requirements
- Compatible with original equipment manufacturer chassis specifications
Applications
- Replacement power supply for Fender Blues Jr. guitar amplifiers
- Restoration of vintage tube amplifier chassis
- Custom tube amplifier builds requiring specific secondary voltages
Procurement Notes
Verify that the target amplifier model matches the intended replacement specification, as the 290XX is explicitly documented for Fender Blues Jr. units. Confirm that the existing chassis can accommodate the physical dimensions and mounting hole patterns associated with this transformer series. Ensure that the input voltage rating aligns with the local mains frequency and voltage standards before installation to prevent operational failure.
Selection Notes
Select this component when repairing or rebuilding amplifiers that require the specific secondary voltage profile of 330V DC at 68mA alongside 20.5V and 6.6V taps. Consider the physical footprint and weight constraints of the enclosure, as this unit weighs approximately 3.74 kg. Verify compatibility with the existing rectifier and filter capacitor ratings to ensure the power supply section can handle the specified current loads without overheating.
Part Context
This part belongs to the Hammond 290 series, which includes various power transformers tailored for musical instrument amplification. Other models in this family, such as the 290TX and 290PX, offer different voltage and current configurations for distinct amplifier types like the Bassman or general tube applications. The 290XX represents a specialized variant optimized for lower-power boutique and classic combo amps.
Replacement Considerations
The 290XX is noted as discontinued but may still be available in stock from certain distributors. When sourcing replacements, verify if alternative Hammond models provide identical electrical characteristics. Ensure that any substitute part maintains the same physical mounting dimensions and terminal layout to fit the existing chassis without modification.
