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Old Pioneer SA 700 amp- only left channel works. It will play all inputs- tuner, turntable, etc, but right channel will play none. What's the likely problem? If I can buy the part, I'm not a pro, but I'll buy it and try to replace it myself and see if that does it. Thanks, Dave

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I have one of these exact amps, more than likely its the volume pot that will need a clean with some WD40 to clean the dust build up inside, try putting the balance on that channel alone and turn the volume up, if the sound kicks in or trys to kick in, this will be the problem or the track inside the pot maybe very worn on the lower setting, which will need then replacing, remember these amps are around 40 years old and chances are it has done a lot of work, if this doesn't fix the problem, as the previous post said it may be in the power amp section and could just be a dry joint on any of the componets, you can pick up all the componet parts fairly easily and cheaply nowdays anyway, let me know how you go.

Posted on May 31, 2010

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Stereo amps are basically two single amps put together with a power supply that drives them both.
So in this case one of the amp sections has failed. The first thing to do is look around and see if anything is damaged, burnt etc.
If you turn the volume up fully on the right channel and hear weak sound/music, then the pre-amp might be good. In which case you need to replace/look at whatever is on the heat sink and determine what works the right channel on it.
If you don't hear any sound at full volume, then the pre-amp section has failed. You might find this to be an IC.
If you probe the amp section with an isulated tool you might get it to buzz. Since the left amp will be the same as the right, probing the left will tell you what the right should do. Keep away from the power supply part!

Posted on Nov 18, 2009

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Posted on Jan 02, 2017

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1 Answer

Again...how do you hook up these 3 items...i have no manual...a Pioneer stereo tuner control, power amplifier, double cassette deck, and speaker...pioneer model #CX-770, CT - W 770, & M - 770?


This would be easier to help you with pictures but I will give you the basics. There should be an input that is labeled either cassette deck or line in. That is where you will plug in the cassette player (that is coming from the output of the player) The cords should be red and white for left and right audio. The back of the tuner should have an output labeled something like preamp out. That will be any number of types of connectors but you should be able to find the right cables. From that output put that in the left/right channel of the amp. It may be labeled something like channel 1 channel 2 input. The speakers will go to the output to the speakers probably also labeled channel 1 and 2. If you post pictures of the backs of all of the equipment I will get more detailed.

Jul 26, 2014 | Audio Players & Recorders

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I am getting extremely faint sound from the left channel while playing vinyl. I have swapped all wires and cables left to right and back and the problem remains the same. The only thing I haven't tried is...


If you switch the cables so the left channel plays into the right of the amp and the sound stays dead in the left channel of the amp it's not the cartridge that is at fault by your amp. Amps have a magnetic cartridge pre-amp built into them for turntables. This can go faulty, but won't effect any other device (CD etc). Most of these pre-amps are a single IC. Which will need to be replaced.

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About 11 months ago I bought an Elliptical upgrade stylus for the PL-990 and it worked great. Recently, it started giving me problems. The left channel would be very distorted and also would fade in and...


Very odd! Sounds like it's not fitting in right. Are you sure that you have the right type of stylus for the cartridge? If in doubt replace the entire cartridge & Stylus. If it still plays up then it's in your amp after that course of action.

Aug 18, 2011 | Pioneer PL-990 Turntable

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I have vestax 05pro2. Left channel works but out of one speaker. The turntable input is good. Im thinking Its either the channel fader, or the rca inputs for that side. Has anyone had this problem?


Hi,
Here's a solution to see if you have a problem with either your receiver or turntable.
The turntable has 2 RCA's one red for right channel, and one white or black for left channel, which plug into the back of the amplifier.

  • Unplug both RCA from rear of amplifier.
  • Plug in a cd or dvd player into those inputs on the amplifier, the sound will be lower but it will give you an indication if the amplifier is ok or not.
  • If you have sound on both channels left and right then the amplifier is good
  • If you still only have sound on left channel, then there is a problem with the right channel input on the amp.
  • If your amp, is good, unplug the cd /dvd player.
  • Put a record on and start playing the record
  • Plug the white or black RCA from the turntable into the rear of the amplifier marked left, you should have sound.
  • now unplug it from the left and plug in into the right red RCA socket, if you have sound the amplifier is working fine.
  • if there is no sound there may be a problem with the stylus cartridge on the turntable
  • now lets reverse the test
  • unplug both RCA from amp.
  • Plug the red RCA into the left socket on amplifier, if there is sound, turntable is working fine, if no sound there is a problem with either the stylus cartridge or that red RCA cable.
  • now unplug the red RCA from the left side and plug it into the right side socket
  • if there is no sound there may be a problem with the stylus cartridge or RCA cable.
I hope this helps

MobileJB

Jul 15, 2011 | Audio Players & Recorders

1 Answer

I believe I have lost the left channel on my GII. Is that a common difficulty? How can I verify that is the problem? I've had this unit for 7 years. Right channel continues to pump out sound and...


No just the cartridge perhaps! First disconect the wires to the cartridge. With the amp on. Touch the end of the wires one at a time (don't worry you won't get a shock). On two of the wires you should hear a hum on each channel (one for left one for right). The left channel should hum. If it doesn't it's not the cartridge, but either a faulty lead or the left phono pre-amp is faulty on your amp. Test the amp by putting the right in the left channel.
If the left hums the cartridge is faulty.

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Sound very distorted


This turntable has a preamp switch on it, which is probably on and what is causing the distortion. Take off the metal record platter by lifting up on the two holes gently. Turn the pre-amp switch to 'off' and then try it again. This is probably it...

Or you can plug it into an input that doesn't have a preamp and that should work.

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I have a Pioneer SG-540 stereo Graphic Equalizer that only works in the right channel, but more importantly puts out a large amount of excess humming moise and other unwanted sounds when the controls are...


I use the sg 540 equalizer for cd and tuner. (I have two of them) I also use the sa 940 to power my sound. On the tuner input of the amp, i used standerd rca cables and connected it to the output of the equalizer. then i connected rca cables from the input of the equalizer to the output of the tuner. this only works when the top equalizer button is pushed on. hope it works for you.

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check volume balance between right and left-then change inter connection between sound source and amplifier with new cabel(i prefer gold plated type connectors)(see radio shack).
after that if the problem excit your fault in output transistors or output stereo ic depend on circuit design.

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