1750V Hammond 30W Übertrager AC30 Vintage handwired Vox
€134.80
Delivery time: ca. 1 - 3 days
4 kO plate-to-plate with 8 and 16 O outputs for four EL84 valves in use
P-TVO30V and paper winding distinguish it from 1750T Reissue models
30 W, 6.30 H, 70 Hz15 kHz, 1.81 kg and 2 kV isolation in use overall
Hammond 1750V – paper-wound AC30 Vintage output transformer
The Hammond 1750V is a paper-wound push-pull output transformer for the amplifier family documented by Hammond as AC30 Vintage. It provides 4 kΩ plate-to-plate, a 30 W rating and 8 and 16 Ω secondary taps.
The comparison reference is P-TVO30V. Despite similar headline ratings, the 1750V differs from the bobbin-wound 1750T AC30 Reissue version in winding type, inductance, resistance, lead length and mechanical construction.
Suitable applications
- Vox AC30 Vintage amplifiers with a matching transformer and chassis version
- Replacement applications around comparison reference P-TVO30V
- Push-pull stages using four EL84 or 6BQ5 valves in total
- New amplifiers requiring approximately 4 kΩ and a paper winding
- Total loudspeaker loads of 8 or 16 Ω
- Handwired AC30 projects only where complete technical compatibility is confirmed
Technical data
- Product type
- Push-pull guitar-amplifier output transformer
- Model
- Hammond 1750V
- Documented amplifier application
- Vox AC30 Vintage
- Hammond comparison reference
- P-TVO30V
- Primary impedance
- 4 kΩ plate-to-plate with centre tap
- Secondary impedances
- 8 and 16 Ω
- Transformer power rating
- 30 W
- Typical output-valve complement
- Four EL84 or 6BQ5 valves in total
- Winding type
- Paper winding
- Primary inductance
- Approx. 6.30 H at 1 kHz, 1 V and open secondary
- Yellow-to-red primary DC resistance
- Approx. 70.37 Ω
- Red-to-white primary DC resistance
- Approx. 70.30 Ω
- Total yellow-to-white primary DC resistance
- Approximately 140.67 Ω
- Black-to-blue secondary DC resistance
- Approx. 0.720 Ω across the complete 16 Ω winding
- Secondary inductance at 8 Ω
- Approx. 19.66 mH
- Secondary inductance at 16 Ω
- Approx. 35.32 mH
- Primary leakage inductance
- Approx. 5.14 mH at 1 kHz, 1 V and short-circuited secondary
- Frequency response
- 70 Hz to 15 kHz, 0/-1 dB referenced to 1 kHz
- Distortion
- Less than 2% at 70 Hz under the documented test conditions
- Dielectric test
- 2,000 V RMS
- Temperature range
- -40 to +105 °C
- Lead length
- At least approximately 305 mm or 12 inches
- Dimensions
- Approx. 79.4 × 84.5 × 96.0 mm
- Mounting dimensions
- Approx. 63.5 × 61.9 mm
- Mounting slots
- Approx. 4.8 × 10.3 mm
- Hammond shipping weight
- Approx. 1.81 kg
- Manufacturing note
- Made in Canada according to the current component drawing
Lead connections
- Yellow
- First primary connection to one output-valve group
- Red
- Primary centre tap to B+
- White
- Second primary connection to the opposite output-valve group
- Black
- Secondary common or loudspeaker ground
- Green
- 8 Ω loudspeaker tap
- Blue
- 16 Ω loudspeaker tap
AC30 Vintage and handwired versions
Hammond's official assignment is AC30 Vintage. A particular handwired version can be compatible where the primary load, speaker taps, mounting, lead routing and feedback phase correspond.
The word handwired alone is not a complete service-part identifier. Compare the original transformer, chassis revision and circuit before installation.
Comparison with the Hammond 1750T
- Hammond 1750V
- Paper winding, 6.30 H primary inductance, AC30 Vintage and P-TVO30V
- Hammond 1750T
- Bobbin winding, 15.2 H primary inductance, AC30 Reissue and P-TVO30R
The shared 4 kΩ, 8/16 Ω and 30 W headline ratings do not establish automatic mechanical or electrical interchangeability.
Safety notes
Lethal plate and signal voltages are present on the primary. Install the open transformer with complete touch protection and fully discharge the amplifier before service work.
Questions about selection and use
Which output transformer suits a Vox AC30 Vintage using P-TVO30V?
Hammond 1750V is intended for the documented AC30 Vintage application and comparison reference P-TVO30V and provides 4 kΩ plate-to-plate, 8/16 Ω taps, paper winding and a 30 W rating.
Which paper-wound 30 W output transformer suits four EL84 valves requiring 4 kΩ plate-to-plate?
Hammond 1750V is a suitable starting point for a correctly designed four-EL84 push-pull stage requiring 4 kΩ plate-to-plate and a total loudspeaker load of 8 or 16 Ω.
Can the Hammond 1750V be configured for 8 or 16 Ω?
Yes, the Hammond 1750V has a green 8 Ω tap and a blue 16 Ω tap. Use the connection matching the actual total loudspeaker impedance.
Can the Hammond 1750V be used in a handwired AC30 version?
Yes, the Hammond 1750V can be used in a handwired version when it technically corresponds to the documented AC30 Vintage application and the mounting, 4 kΩ primary and 8/16 Ω connections match.
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: 1,82 kg