If you're talking about a power supply, as in a complete and separate unit, then probably things are not as I am assuming. You could probably give a little more info on that power supply, and we could decipher the wiring on the transformer. That doesn't say much, since that technique has been in use for several decades, but it does say that the manufacturer paid some attention to making the unit a better performer, humwise at least. You have described a power transformer which has a copper band surrounding it- this reduces hum in surrounding circuitry. The radio sections in most receivers run on 12 volts, some are fed more.
A newer type receiver would have twin power supply voltages, probably in the range of + and - 25 to 50 volts. That means the ac output of that transformer would be from 20 to maybe 35 volts. Als überarbeiteter Nachfolger der überaus erfolgreichen Regal-Lautsprecher nuBox 381, setzt man auch hier wieder auf ein solides Tieftonfundament, auf das sich sauber ausgewogene Mitten und Höhen ausbauen. If that's the case, if it's an older unit, it would probably have a single voltage supply that runs the amplifier section, and that voltage would be around 30 - 50 volts after being rectified. Mit der neuen nuBox 383 wirft der schwäbische Lautsprecherprofi Nubert erneut einen Kandidaten für unser Highlight-Logo auf den Markt. You're calling it a receiver- that says to me that it's a home stereo component.
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