TOROIDAL TRANSFORMER
For MARANTZ models 2500/2600
Eng. Antonio Pelli Neto
Marantz 2600 and Sansui G9000 (from my collection)
Service manuals for Marantz receivers are famous for their lack of information, or providing information that is
incorrect and/or incomplete. In the specific case of Marantz models 2500 and 2600, the manuals additionally
contain misleading information about the capacity and positioning of some electrolytic capacitors, and they do not
contain important data on voltage and current for the toroidal transformers accompanying the products. These
transformers were also famous for burning out, which presented problems in the construction of new units.
The purpose of this text is to allow electronic technicians, or even Marantz 2500/2600 owners with dead toroidal
transformers, to recover your receivers. Although my training is in Civil and Mechanical engineering, my hobby is
recovery and restoration of electronic equipment, especially equipment considered "vintage". I do not work as an
electronic technician, nor do I provide maintenance services for electronic equipment. This, as I’ve said, is just a
hobby, although I've been involved in it for over 40 years. So, I take no responsibility for the information provided
here, however I have successfully utilized it in the recovery of my own devices.
A POSSIBLE ERROR DETECTED IN SERVICE MANUAL
The Marantz 2500 and 2600 service manuals display the following diagram for connecting the toroidal
transformer:
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