TX976 - 50-100W Output Transformer


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Hobbyists and amp builders can now use the same high-quality transformers and chokes found in London Power's own amp line. Our output transformers feature direct-impedance matching, ultralinear taps, flux band, and wide power bandwidth.


  • Direct impedance taps for 2, 4, 8 and 16 ohms
  • 4k3 plate-to-plate
  • Ultralinear taps
  • Hifi bandwidth to 60W
  • MI bandwidth to 120W
  • Shielded black powder-coated end bells
  • Flux band
  • X-mount (vertical; 4-bolt)
  • 18" stranded leads
  • Weight: 6.7 lbs., 3.1 kg

Applications: Used conservatively in our 50W amps and the new 100W 4-tube amp kits. Easily replaces Marshall 100W OTs while retaining direct matching to any speaker load. Use it with the 270HX/370HX to make a heavy-duty AC-30. Replaces Traynor YBA-1A OT for 80W output and matching to any load.

Use a pair with 278CX/378CX for 60+60W hifi or 80+80W MI. For hifi, a pair of KT-88s or 6550s can easily drive TX976 to 100W. Use the Low-Z drive circuit shown in our book DSN-1 (Designer Series Notes vol.1) to extend bandwidth.

Dimensions: 3.8H x 3.2W x 4.2D (over end bells),  97 x 82 x107mm

Mounting: X-style:3 x 2.5", 76 x 64mm

About London Power

London Power was founded in 1990 by Kevin O'Connor, after two decades of research into innovative audio amplification techniques. Kevin is an audio designer, author and speaker, known for his proprietary methodology called Power Scaling, and for his eleven books on audio subjects. Whether you seek amps, kits or information, you'll find useful answers here on not just the "how" but the "why" of audio amplifier design. Please enjoy the information on this site, and don't hesitate to contact us with questions.

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(807) 473-0952
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PO Box 10012, Thunder Bay, ON P7B 6T6 CANADA