Replacement Sansui Transformers

Sansui AU-70

Sansui Part Number: 410-5200A

Frequency Response: 10 Hz to 100 kHz +/- 1 dB @ 1 Watt

Primary DC Resistance: 300 ohms

Primary Inductance: 110 H @ 120 Hz

Part Number : TT-420-OT



Sansui 1000A

Frequency response: 15 Hz to 100 kHz +/- 1 dB @ 1 Watt

Primary DC Resistance: 260 ohms

Primary Inductance: 35 H @ 120 Hz

Part Number: TT-421-OT

Sansui Transformer Rewind Service

1. Defective Transformer 

A transformer with an open primary winding.

2. End Bells Removed

3. Core Removed

We index mark and carefully remove the old core for re-use in the rewound transformer.

4. Transformer Unwound

The transformer is carefully unwound to count turns, measure wire size, and determine interleave pattern.



5. New Coil Wound

Using the information gathered during the unwinding process, a new coil is wound.

6. Coil Finished

Teflon lead wires are added in the original colors.



7. Coil is Varnished

The coil is varnished in a polyester resin.



8. Core is Intalled

The original core is installed into the new coil. The assembly is then baked in an oven to re-set the wax impregnating the core.



9. Finished Transformer

Coil wedges and end bells are reinstalled to finish the transformer..



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