Hammond 1140-LU-C 600 Ohm 1:1 Line Output Transformer, 80% Nickel
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Create Free Business AccountKey Features
- 600:600 impedance ratio, 1:1 turns ratio
- 0.001% THD at 20 Hz (rated) and at 1 kHz
- Bi-filar windings on an 80% Ni core
- Drives 600 Ω loads up to +18 dBu at 20 Hz
- Frequency response -0.05 dB at 20 Hz / +0.02 dB at 20 kHz
- 105 dB CMRR at 60 Hz, 85 dB at 3 kHz
- Open style chassis mount; 8" colour-coded leads; RoHS and REACH compliant
The 1140-LU-C is a 1:1, 600:600 line output transformer in the 1140 Series, built for clean balanced line outputs in studio and broadcast gear. It combines bi-filar windings with an 80% Ni core, which the drawing credits with very low distortion levels and good output levels.
It can drive 600 Ω loads up to +18 dBu at 20 Hz. Distortion is its strength: rated THD at 20 Hz is 0.001%, and the drawing lists 0.001% at both 1 kHz and 20 Hz (4 dBu). Frequency response is -0.05 dB at 20 Hz and +0.02 dB at 20 kHz, with phase shift of 0.09° at 20 Hz and -0.75° at 20 kHz. Common mode rejection is 105 dB at 60 Hz and 85 dB at 3 kHz.
DCR is 40 Ω for both primary and secondary at 20 °C, typical primary input impedance is 680Ω and secondary output impedance 80Ω at 1 kHz and 0 dBu, capacitance to shield and case is 20 nF primary and 50 pF secondary, and dielectric strength is 250 Vrms. The drive signal should have no DC component and the source impedance should be as low as possible.
The 1140-LU-C is open style (not Mu Metal) for chassis mounting, with colour-coded leads of 8" minimum length: brown/orange primary and green to green/yellow secondary. It is RoHS and REACH compliant, made in Canada, and ships at 0.2 lbs (0.09 kg).
Ideal For
- Low-distortion 600 ohm line outputs
- Studio and broadcast output stages
- Balanced line driving
- Output isolation
Overview
| Series | 1140 Series – Studio Grade Impedance Matching Transformers |
| Description | Audio transformer, line output, chassis mount, impedance ratio 600 to 600 |
| Product Type | Line output transformer, chassis mount |
| Drawing Title | Chassis Mount Line Output Transformer |
| Series Category | Line Output Transformers |
| Short Description | CHASSIS MT LINE OUTPUT TX |
Electrical
| Impedance Ratio | 600:600 |
| Input Impedance | 600 Ω |
| Lead Colour Code | PRI: BRN - ORG (600 Ω); SEC: GRN - GRN/YEL (600 Ω) |
| Output Impedance | 600 Ω |
| Drive Requirement | Drive signal should have no DC component; source impedance as low as possible |
| Dielectric Strength | 250 Vrms |
| Phase Shift @ 20 Hz | 0.09° |
| THD @ 20 Hz (Rated) | 0.001% |
| Turns Ratio (Rated) | 1:1 |
| Phase Shift @ 20 KHz | -0.75° |
| Primary DCR @ 20 °C | 40 Ω |
| Secondary DCR @ 20 °C | 40 Ω |
| Max Input @ 20 Hz (Rated) | +18 dBu |
| Series Frequency Response | 20 Hz – 20 kHz ±0.35 dB (ref. @ 1 kHz) |
| Common Mode Rejection @ 3 KHz | 85 dB (0 dBu, Test Circuit 2) |
| Common Mode Rejection @ 60 Hz | 105 dB (0 dBu, Test Circuit 2) |
| Turns Ratio (Typical, Drawing) | 1:1 |
| Maximum Level @ 20 Hz (RL = 600 Ω) | +18 dBu |
| THD @ 1 KHz (4 DBu, Test Circuit 1) | 0.001% |
| THD @ 20 Hz (4 DBu, Test Circuit 1) | 0.001% |
| Capacitance, Primary To Shield And Case | 20 nF |
| Capacitance, Secondary To Shield And Case | 50 pF |
| Frequency Response 20 Hz / 20 KHz (Rated) | -0.05 dB / +0.02 dB |
| Frequency Response @ 20 Hz (0 DBu, Test Circuit 3) | -0.05 dB |
| Frequency Response @ 20 KHz (0 DBu, Test Circuit 3) | +0.02 dB |
| Primary Input Impedance (@ 1 KHz 0 DBu, Test Circuit 3) | 680Ω |
| Secondary Output Impedance (@ 1 KHz 0 DBu, Test Circuit 4) | 80Ω |
Identifiers
| UPC | 623980930329 |
| UNSPSC | 39121301 |
| Country Of Origin | Canada (Made in Canada) |
Packaging & Shipping
| Shipping Weight | 0.2 lbs (0.09 kg) |
Construction & Finish
| Core | 80% Ni core |
| Leads | Colour coded, 8" min. length |
| Mounting | Chassis mount |
| Windings | Bi-filar |
| Shielding | Open style (not Mu Metal) – series note for Line Output Transformers |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What distortion does the 1140-LU-C have?▾
Rated THD at 20 Hz is 0.001%; the drawing also lists 0.001% at 1 kHz (4 dBu).
What maximum level can it drive?▾
Up to +18 dBu at 20 Hz into a 600 Ω load.
What core and windings are used?▾
An 80% Ni core with bi-filar windings.
What are the source requirements?▾
The drive signal should have no DC component and the source impedance should be as low as possible.
Is the 1140-LU-C enclosed in mu metal?▾
No, the 1140 line output transformers are open style (not Mu Metal).
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