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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：3.375" L x 2.385" W (85.73mm x 60.58mm)
- Height - Seated (Max)：2.876" (73.05mm)
- Termination Style：Solder Lug
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：-
- Impedance - Secondary (Ohms)：-
- DC Resistance (DCR) - Primary：8.054Ohm, 9.752Ohm
- DC Resistance (DCR) - Secondary：166mOhm, 4.776Ohm, 52.25Ohm
- 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 290QX is a power transformer designed for Marshall JTM30 guitar amplifiers. It features dual primary windings rated at 120/240 VAC and supports 50/60 Hz operation. The secondary output provides 325 VAC at a maximum current of 270 mA. This component utilizes chassis mounting and wire lead termination, serving as a direct replacement for original equipment in tube-based audio applications.
Feature Summary
- Dual primary winding configuration supporting multiple input voltages
- Chassis mount design with wire lead connections
- Optimized for vintage tube amplifier circuitry
Applications
- Marshall JTM30 guitar amplifier restoration
- Vintage tube amplifier repair
- Audio equipment maintenance
Procurement Notes
Verify the specific voltage requirements of the target amplifier against the transformer's dual primary ratings before installation. Confirm that the secondary voltage and current specifications match the original component to ensure proper circuit function and safety. Check for physical compatibility regarding chassis mounting dimensions and terminal types.
Selection Notes
Select this model specifically for Marshall JTM30 units requiring a 325V secondary output. Ensure the application involves standard tube amplifier designs compatible with the specified current rating. Consider the chassis mounting style when planning the internal layout of the amplifier enclosure.
Part Context
This transformer belongs to the Hammond 290 series, which specializes in replacements for classic guitar amplifiers. It is categorized under industrial power transformers but tailored for niche audio electronics. The series includes various models targeting different amplifier brands and power requirements.
Replacement Considerations
- Hammond 290EX
FAQ
What are the primary voltage options for the 290QX?
The transformer supports dual primary voltages of 120 VAC and 240 VAC.
Is this transformer suitable for solid-state amplifiers?
No, it is designed specifically for tube-based guitar amplifiers like the Marshall JTM30.
