290BEX Hammond Netztrafo Fender Deluxe 041316 Replacem.

Hammond 290BEX – 240 V power transformer for Deluxe and Deluxe Reverb

The Hammond 290BEX is an open-frame power transformer for classic valve guitar amplifiers. Its single primary winding is rated for 240 V at 50/60 Hz. The secondary windings provide 330-0-330 V at 138 mA, a 50 V bias tap, 6.3 V at 3 A and a separate 5 V winding at 3 A.

Hammond lists the 290BEX for compatible Deluxe and Deluxe Reverb versions. Its current application-specific information identifies Fender references 125P2A, 125P23B, 022749 and 025130.

Suitable applications

• Compatible Deluxe circuits including 5A3, 5B3, 5C3, 5D3 and 6G3
• Compatible Blackface and Silverface Deluxe Reverb circuits
• Applications associated with current Fender references 125P2A, 125P23B, 022749 or 025130
• Valve amplifiers requiring a 330-0-330 V supply and tube rectifier
• 240 V power supplies requiring a separate 50 V bias tap

Technical data

Product type

Power transformer for valve guitar amplifiers

Manufacturer applications

Deluxe and Deluxe Reverb versions documented by Hammond

Current Fender references

125P2A, 125P23B, 022749 and 025130

Historical Hammond cross-reference

125P23D and 041316; not suitable as a stand-alone current replacement confirmation because later Hammond assignments differ

Primary winding

One fixed 240 V winding for 50/60 Hz

High-voltage winding

660 V CT, equivalent to 330-0-330 V, at 138 mA

Bias supply

50 V tap on one half of the high-voltage winding

Valve-heater winding

6.3 V at 3 A, without an accessible centre tap

Rectifier-heater winding

Separate 5 V winding at 3 A

Winding construction

Described inconsistently as paper wound and bobbin wound in current Hammond documents

High-voltage no-load reading

701.89 V CT according to the Hammond drawing

6.3 V winding no-load reading

6.79 V

5 V winding no-load reading

5.43 V

Turns ratio

1:2.95 between the primary winding and complete red-to-red high-voltage winding

Exciting current

165 mA maximum at 240 V and 50 Hz

Primary DC resistance

11.941 Ω between white and black, ±20% at 20 °C

High-voltage winding DC resistance

112.5 Ω between red and red, ±20% at 20 °C

6.3 V winding DC resistance

0.073 Ω between green and green, ±20% at 20 °C

5 V winding DC resistance

0.061 Ω between yellow and yellow, ±20% at 20 °C

Dimensions

Approx. 71.5 × 103.2 × 85.7 mm according to drawing dimensions A × B × C

Mounting-related dimensions

D approx. 52.0 mm, E approx. 57.2 mm and F approx. 71.5 mm

Flying leads

At least 9 in or approximately 229 mm long and stripped by approximately 12.7 mm

Shipping weight

Approx. 2.41 kg according to Hammond

Connection details

240 V primary winding

Black–white; apply the mains supply between the black and white leads

High-voltage winding

Red and red are the two 330 V ends; red/yellow is the centre tap

Bias tap

Blue provides 50 V AC relative to the red/yellow centre tap

6.3 V heater winding

Green–green, rated 6.3 V at a maximum of 3 A; no separate centre tap

5 V winding

Yellow–yellow, rated 5 V at a maximum of 3 A for a compatible tube rectifier

Reference note concerning 041316

An older Hammond selection guide lists 125P23D and 041316 for the 290BEX. The current Deluxe application page instead lists 125P2A, 125P23B, 022749 and 025130. Current Hammond information also associates 041316 with the higher-current 290CX or 290CEX application family.

Reference 041316 alone is therefore insufficient for safe selection. Compare the high-voltage current, heater current, primary voltage, mounting pattern and lead colours with the original transformer.

Comparison with related Hammond models

Hammond 290BEX

240 V at 50/60 Hz, 660 V CT at 138 mA, 6.3 V at 3 A and 5 V at 3 A

Hammond 290BX

120 V, 60 Hz version in the same basic Deluxe application family

Hammond 290CEX

240 V version for later Deluxe Reverb Reissue applications with 650 V CT, a higher high-voltage current rating and 6.3 V at 4.5 A; not electrically identical

Selection and installation notes

The specified 330-0-330 V, 6.3 V and 5 V figures are rated values under load. No-load voltages are higher. The final B+ rail also depends on the rectifier, filtering, actual mains voltage and amplifier current demand.

The 290BEX has no dedicated 230 V primary tap. Ideal proportional scaling at exactly 230 V gives approximately 316-0-316 V, 47.9 V at the bias tap, 6.04 V and 4.79 V. These are calculated estimates and must be checked under load.

Because the 6.3 V winding has no accessible centre tap, its heater reference must follow the exact schematic using an artificial centre tap, hum-balance network or existing amplifier circuit.

Mains wiring, primary fusing, protective earth, strain relief, touch protection and insulation clearances must be completed by a qualified technician. Filter capacitors can retain lethal voltages after disconnection from the mains.

Questions about selection and use

Is the Hammond 290BEX suitable for documented Deluxe and Deluxe Reverb circuits?

Yes, Hammond lists the 290BEX for compatible Deluxe and Deluxe Reverb versions and currently identifies Fender references 125P2A, 125P23B, 022749 and 025130. The mechanics, schematic and mains voltage must match.

Can the Hammond 290BEX be operated from a European 230 V mains supply?

Yes, the primary winding is nominally rated for 240 V and may be used from 230 V when the correspondingly lower secondary voltages suit the circuit. Measure the heater, bias and high-voltage rails under load.

Can the Hammond 290BEX be used as the 240 V alternative to the Hammond 290BX?

Yes, Hammond lists the 290BEX as the 240 V version in the same Deluxe application family, while the 290BX is intended for 120 V at 60 Hz. Check the connections and mounting dimensions against the specific amplifier.