Hammond 290MAEX Upgraded JTM 45/50 Power Transformer, 625Vct Tap
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Create Free Business AccountKey Features
- Upgraded power transformer for JTM 45 and 50 Watt amplifiers
- Additional high voltage tap: 625Vct
- Flux band fitted
- 5V winding bumped to 3A
- Domestic/international primary: 100/120/220/230/240V, 50/60 Hz
- Bobbin core; styled to look similar to the original where possible
- RoHS and REACH compliant; 11 lbs (4.99 kg) shipping weight
The 290MAEX is an upgraded replacement power transformer for Marshall* JTM 45 and 50 Watt tube guitar amplifiers. It is aimed at amp technicians and builders who want the stock JTM-style layout with a few extras compared with the standard replacement in the same series.
The upgrades listed by the manufacturer are:
- An additional high voltage tap of 625Vct
- A flux band
- The 5V winding increased to 3A
The primary is multi-tapped for domestic and international mains at 100, 120, 220, 230 or 240V, 50/60 Hz. Construction is on a bobbin core. As with the rest of this JTM 45/50 group, the part was designed to look similar to the original factory unit where possible, with materials and design specifications kept close to the original to preserve the stock tone.
The 290MAEX ships at 11 lbs (4.99 kg) and is RoHS and REACH compliant. The original Marshall* part number is listed as unknown; check the manufacturer's drawing for full specifications and dimensions. Hammond Mfg. is not affiliated with Marshall Amplification, and model names are used for reference only. The same JTM 45/50 replacement group also lists a 4, 8, 16 Ohm output transformer and a 7H @ 150 mA DC choke.
Ideal For
- Upgrading the power transformer in a JTM 45 or 50 Watt amp
- JTM-style tube amp builds needing a 625Vct high voltage tap
- Amps needing a 3A 5V rectifier heater supply
- International-voltage tube amp restorations
Overview
| Product Type | Upgraded Power Transformer |
| Short Description | POWER TRANS |
| Amplifier Application | Marshall* JTM 45 and 50 Watt |
| Original Marshall* Part No. | Unknown |
Electrical
| Frequency | 50/60 Hz |
| 5V Winding | 3A |
| Primary Voltage | 100/120/220/230/240V (Domestic/International) |
| Additional High Voltage Tap | 625Vct |
Identifiers
| UPC | 623980184616 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 11 lbs (4.99 kg) |
Construction & Finish
| Core | Bobbin |
| Design | Designed to look similar to the original factory unit (where possible) |
| Flux Band | Yes |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What makes the 290MAEX an upgraded version?▾
It comes with an additional high voltage tap of 625Vct, a flux band, and the 5V winding bumped to 3A.
Which amplifiers use the 290MAEX?▾
It is listed for Marshall* JTM 45 and 50 Watt amplifiers.
What mains voltages does the 290MAEX support?▾
The primary is rated 100/120/220/230/240V, 50/60 Hz for domestic and international use.
How heavy is the 290MAEX?▾
Its shipping weight is 11 lbs (4.99 kg).
What is the original Marshall part number?▾
The manufacturer lists the original Marshall* number as unknown.
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