I always wanted one of these little Technics receivers. Trouble is, it seems that people treat these like junk. Every one of these that I came across was either burned out, totally dead with major internal damage or just beaten to pieces. This one is an exception...outside of a burned out bulb and dirty protection relay contacts, it works perfectly. It puts out somewhere around 30 watts of power into an 8 ohm load, and has (probably) useless-but-cool power indicator "bar" LEDs on the front panel. Another problem with these receivers comes from the Sanyo-designed and/or sourced integrated power amp package. These "stereo amp in a black box" amplifier modules sometimes self-destruct, especially if driven hard. An electronic circuit in the package is supposed to disconnect the speakers from the amplifier if this happens, but it usually is damaged when the integrated final transistors fail. The result is a power supply voltage rail appearing on the speaker wires. This burns out the speaker, or if you're really unlucky and both channels of the device fail, both of your speakers may be burned out. Most of the Technics receivers of this style don't have an external protection relay to stop this. This one is a notable exception in that it does have the relay...so speakers attached to it ought to be safe. It's a big enough problem that if yours does not, you should use outboard speaker protection devices.
http://www.youtube.com/watch?v=K0cObJ7o8vE&hl=en
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Maybe you can help me with a quick question. I just purchased one of these, and was wondering what you mean by outboard speaker protection devices? I am not planning on running it anywhere near it's full capacity, but want to make sure I don't destroy my speakers. I'm also kind of new to vintage audio, and audio in general.
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