Hammond 290JX 100W JCM 900/JCM2000 Marshall Power Transformer
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Create Free Business AccountKey Features
- Listed for Marshall JCM 900 and JCM2000 100 watt (reference only)
- 120/240 VAC 50/60 Hz primary
- 360V @ 450 mA high-voltage secondary
- 6.3Vct heater (7A in ordering table; 8A per drawing rev. 1)
- 43Vct @ 250 mA auxiliary winding
- Bobbin-wound; hipot tested 2500V, 60Hz, 1 sec
- 7.3 lbs (3.31 kg); RoHS and REACH compliant
The 290JX is a Hammond 290 Series power transformer listed as a replacement for Marshall JCM 900 and JCM2000 100 watt amplifiers. The part page short description reads AUDIO 100 VA 365V/40VCT/6.3VCT. It is intended for technicians keeping these amps in service.
The primary is rated 120/240 VAC 50/60 Hz. The ordering table lists a 360V @ 450 mA high-voltage secondary, a 6.3Vct @ 7A heater winding and a 43Vct @ 250 mA winding; drawing revision 1 records the 6.3VCT winding as 8A (was 7A). The winding is bobbin.
Drawing test data at 120V, 60 Hz gives a 200mA maximum excitation current and no-load voltages of 374.6V (pins 8-9), 7.310V on the heater (3.655V per half) and 45.08V on the WHT-WHT winding. It is hipot tested primary to secondary at 2500V, 60Hz for 1 second, with leads 11.0" minimum out, stripped 0.5". Drawing dimensions are A 3.750", B 3.980", C 3.125", D 3.125", E 2.500" and G 0.219".
Hammond designed the 290 Series for drop-in replacement of original units, with parts made to look similar to the original factory transformers where possible and materials and design specs kept as close as possible to the original part to preserve the stock tone.
The 290JX ships at 7.3 lbs (3.31 kg), is RoHS and REACH compliant, and carries UPC 623980094274 and UNSPSC 39121301.
Ideal For
- Marshall JCM 900 100 watt power transformer replacement
- Marshall JCM2000 100 watt repair
- Dual-voltage tube amp service
Overview
| Series | 290 Series (Tube Guitar Amplifier - Power Transformers) |
| Part Number | 290JX |
| Product Type | Power transformer, replacement for Marshall guitar amp, 290 series |
| Short Description | AUDIO 100 VA 365V/40VCT/6.3VCT |
| Amp Model (Ref. Only) | JCM 900 - 100 watt |
| Amp Manufacturer (Ref. Only) | Marshall |
Electrical
| Secondary 1 | 360V @ 450 mA |
| Secondary 2 | 6.3vct @ 7A |
| Secondary 3 | 43Vct @ 250 mA |
| Primary Volts | 120/240 VAC 50/60 Hz. |
| 6.3VCT Winding Current (Drawing Rev. 1) | 8A (was 7A) |
Identifiers
| UPC | 623980094274 |
| UNSPSC | 39121301 |
Dimensions (Drawing)
| Dimension A | 3.750" ±0.063 |
| Dimension B | 3.980" ±0.063 |
| Dimension C | 3.125" ±0.063 |
| Dimension D | 3.125" ±0.063 |
| Dimension E | 2.500" ±0.063 |
| Dimension G | 0.219" ±0.010 |
Packaging & Shipping
| Shipping Weight | 7.3 lbs (3.31 kg) |
Construction & Finish
| Leads | All leads 11.0" min. out, strip 0.5" |
| Winding | Bobbin |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
Electrical Test Data (Drawing)
| DCR @ 20°C, WHT-WHT | 4.232 Ω ±20% |
| Hipot Primary-Secondary | 2500V, 60Hz, 1 sec |
| No-Load Voltage WHT-WHT | 45.08V ±2% |
| DCR @ 20°C, Pin 1 - Pin 2 | 2.178 Ω ±20% |
| DCR @ 20°C, Pin 3 - Pin 4 | 2.488 Ω ±20% |
| DCR @ 20°C, Pin 7 - Pin 6 | 0.025 Ω ±20% |
| DCR @ 20°C, Pin 8 - Pin 9 | 14.24 Ω ±20% |
| No-Load Voltage Pin 3 - Pin 4 | 120.0V ±2% |
| No-Load Voltage Pin 7 - Pin 6 | 7.310V ±2% |
| No-Load Voltage Pin 8 - Pin 9 | 374.6V ±2% |
| No-Load Voltage WHT-BLK = BLK-WHT | 22.54V ±2% |
| No-Load Voltage Pin 7 - Pin 5 = Pin 5 - Pin 6 | 3.655V ±2% |
| Excitation Current (Iex) @ 120V, 60Hz, Pin 1 - Pin 2 | 200mA Max. |
Amp Cross-Reference (Ref. Only)
| Listed Amp (Marshall Table) | JCM 900, JCM2000 -100* Watt |
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Frequently Asked Questions
Which Marshall amps is the 290JX listed for?▾
JCM 900 and JCM2000 100 watt models, for reference only.
What are the secondary ratings?▾
360V @ 450 mA, 6.3Vct heater and 43Vct @ 250 mA. The ordering table lists the heater at 7A; drawing revision 1 lists 8A.
What primary voltages does it support?▾
120/240 VAC 50/60 Hz.
How long are the leads?▾
11.0" minimum out, stripped 0.5".
Which part is listed for the 50 watt JCM 900?▾
The 290KX.
