TX120A – 120W / 70V Speaker Transformer

High Quality Sound

The Octasound TX120A-70 audio distribution transformers are designed for the speaker side of a voltage speaker distribution system.

Continuous Use Design

Each unit is designed to operate continuously.

Primary (Input)

The input is designed for a 70V speaker distribution line. 25V, 100V and 140V models available upon request.

Secondary (Output)

The output is designed for a 8 Ohms speaker.

Magnet Wire

All units are wound with the finest virgin copper magnet wire. All windings use heavy insulated wire to provide excellent manufacturing yield, lower customer cost and superior life.

The Core

Octasound transformers use the finest M6 line grain oriented steel cores. Each unit is hand stacked to assure at least 92% stack.


15 inch Wire leads.
Primary: Yellow – 8 Ohms,  Orange – 4 Ohms, White – V.C. Common
Secondary: Red – 120 Watts, Green – 60 Watts, Brown – 30 Watts, White – Line Common


This unit comes with metal bracketed support / frame for mounting with the use of four screws.

Wattage 120W
Primary: 70V
Secondary: 8 and 4 Ohms
Frequency Response: 40~20kHz,<1dBu
THD+Noise: <0.1% @ 1kHz
Insertion Loss: 1 dB
Bobbin Material: Glass Filled Nylon 6/6
Flammability Rating: Class B 130°C
Core Material: M6 29 ga. line grain oriented steel
Termination 15″ Wire Leads
Mounting Zinc plated steel channel / frame
Weight: .75 lbs.
Compliance: RoHS & REACH