Audio Systems: Stereo Reciever, stereo reciever, pre amp

Question
Ok
The receiver from factory comes with two metal like connectors linking the "Main Out" L/R to the "PreAmp In" L/R.  
However at this point without touching anything from factory, only the left channel out the receiver gets sound output to the speakers, which is visually reflected by looking at the front panel meter and only signal readout to that one channel.
When I unplug these factory connectors from the Main to the PreAmp, both channels have output but at full volume.
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Followup To
Question -
I have an older model Technics Receiver, circa early 1990's.  (It's not with me this second)
Only 1 channel is putting out signal.
When I pull out the direct connectors from the "pre amp" to "main out" then both left and right channels output from the "main out", but of course on full power.
1. Anything I can fix?
2. What do you suggest if not, that I could hook up to the main outs to control the amplitude?
Answer -
Dear DJ,

Huh? You have the "preamp" ("out" I presume) connected to the "main out"? And when you disconnect these, you get normal performance? You're confusing me here. Since you have a receiver, there's no need to connect any of the preamp functions, including "main out".

If you're *not* getting normal performance after having made the disconnection, then please tell me what you *are* getting.

Why do you think connecting the main outs to anything will control "amplitude"? What exactly is your objective?

Hope to hear from you.

Kevin

Answer
Dear DJ,

Okay, now I understand.

You have right channel failure in the receiver's preamplifer section. When you pull the connectors, you also disengage the volume control, which is in the preamplifier. Channel failure could be anything: a malfunctioning op amp or resistor, loose wiring, and so on. You'd have to have the unit bench tested to diagnose the real reason.

I think you'll find that repairing a unit that old will not be cost efficient; i.e., it'll cost more to repair it than to replace it. If that's the case, holler back, and I'll recommend some current receivers that perform well in virtually any price range.

Good luck. And thanks for choosing allexperts.com!

Kindest regards,

Kevin