1750B Hammond SE Übertrager Fender Vibro King 024038 Ers.
€39.90
% €43.80 (9% saved)
Delivery time: ca. 1 - 3 days
Verified Fender reference 024038 for the dedicated 6V6 driver in use
5.482 kO primary to 8 O for the spring reverb tank input stage safely
10 W, 6.54 H, 70 Hz10 kHz and a 1.75 kV dielectric test in use overall
Hammond 1750B – 10 W reverb driver transformer for Fender Vibro-King 024038
The Hammond 1750B is a single-ended output transformer for the dedicated reverb driver in the Fender Vibro-King. Hammond assigns it to Fender reference 024038 and a nominal 8 Ω spring-tank input.
The Vibro-King uses a separate 6V6 to provide power drive for the reverb tank. The 1750B must therefore not be confused with the main output transformer of the 60 W loudspeaker amplifier.
Suitable applications
- Repair of the reverb driver in a Fender Vibro-King
- Replacement for the documented 024038 reference
- Single-ended 6V6 drivers feeding a nominal 8 Ω spring-reverb input
- New power-driven valve reverb circuits requiring approximately 5.5 kΩ
- Guitar amplifiers using a separate power-valve reverb driver
- Service and restoration projects with verified mechanical compatibility
Technical data
- Product type
- Single-ended reverb driver transformer
- Model
- Hammond 1750B
- Documented equipment application
- Fender Vibro-King
- Documented reference number
- 024038
- Primary impedance
- 5.482 kΩ
- Secondary impedance
- 8 Ω
- Transformer power rating
- 10 W
- Amplifier topology
- Single ended
- Primary inductance
- Approx. 6.54 H at 1 kHz, 1 V and open secondary
- Secondary inductance
- Approx. 15.89 mH at 1 kHz, 1 V and open primary
- Primary DC resistance
- Approx. 254.6 Ω
- Secondary DC resistance
- Approx. 0.420 Ω
- Primary leakage inductance
- Approx. 174.25 mH at 1 kHz with the secondary short-circuited
- Frequency response
- 70 Hz to 10 kHz, 0/-1.5 dB referenced to 1 kHz
- Distortion
- Less than 1% at 70 Hz under the documented test conditions
- Dielectric test
- 1,750 V RMS
- Temperature range
- -40 to +105 °C
- Winding type
- Current Hammond part page and series list: paper; separate Vibro-King application sheet: bobbin
- Lead length
- At least approximately 229 mm or 9 inches
- Dimensions
- Approx. 73.0 × 48.3 × 60.2 mm
- Mounting centres
- Approx. 60.3 mm
- Mounting-hole diameter
- Approx. 4.75 mm
- Hammond shipping weight
- Approx. 0.45 kg
- Manufacturing note
- Made in Canada according to the current component drawing
Lead connections
- Red
- Marked primary winding start, normally connected to B+
- Blue
- Primary connection to the 6V6 reverb-driver plate
- Black
- Marked secondary winding start or common connection
- Green
- 8 Ω secondary connection to the spring-reverb tank
- Phase
- Follow the original Vibro-King circuit diagram during replacement
Difference from the main output transformer
The Vibro-King is a 60 W amplifier using two 5881 or 6L6 output valves for the loudspeaker stage and an additional 6V6 for the reverb driver. The Hammond 1750B belongs only to the 6V6 reverb circuit.
The Vibro-King main output transformer carries Fender reference 036485 and is listed by Hammond as the 1750KA. The 1750B must not replace the loudspeaker output transformer.
Selection and safety notes
Verify the tank-input impedance, 6V6 operating point, primary voltage and mounting dimensions before installation. Hammond does not publish a separate maximum DC-current figure for the 1750B, so no value should be copied from another reverb transformer.
The primary carries lethal plate voltage. Install the open transformer with complete touch protection and correct insulation.
Questions about selection and use
Which reverb driver transformer suits a Fender Vibro-King using reference 024038?
Hammond 1750B is documented for the Fender Vibro-King reverb driver and reference 024038, providing a 5.482 kΩ primary, 8 Ω secondary and 10 W rating.
Which Hammond transformer suits a 6V6 SE reverb driver requiring approximately 5.5 kΩ to 8 Ω?
Hammond 1750B is a suitable starting point for a correctly designed 6V6 reverb driver using approximately 5.5 kΩ and a nominal 8 Ω spring-tank input.
Can the Hammond 1750B drive an 8 Ω spring-reverb input?
Yes, the Hammond 1750B has an 8 Ω secondary and can drive a compatible spring-reverb input when the 6V6 operating point and tank type suit the primary transformation.
Is the Hammond 1750B suitable for repairing the Vibro-King reverb driver?
Yes, the Hammond 1750B is suitable for this documented repair application when the reference number, lead colours, mounting dimensions and remaining reverb-driver circuit correspond to the original.
Note: All brand names mentioned, such as Marshall, Fender, etc., are registered trademarks of their respective owners and are used here for descriptive and compatibility purposes only.
Hammond Electronics B.V. Willemswerf Boompjes 40
NL-3011 XB Rotterdam
Email: info@hammfg.com
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Source: IHK Mittelfranken
Tariff Number: 85043129
Country of Origin: CA
Weight: 0,45 kg