Amplifier moving spontaneously from one input to another cutting out used source
18 year old onkyo hifi stereo amplifier will not keep a single input channel. It switches from tape deck to Tv to Dvd player etc on its own. It does not seem to be linked to heat because it will go into its dance amoung the channels whether warm (having been in use) or cold (just when we turn it on). the result is that the sound comes and goes willy nilly.
Re: Amplifier moving spontaneously from one input to...
18years is good service you may want to look at upgrading to a newer model. If you have become close to this amp I think the processor for the amp is going bad and you would have to replace the entire board ,and on this old of set woud not be available.
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Let's establish which is the IN and which is the OUT here. The PC is a Line Level source so its OUTPUT would feed one of the amp's Line Level INPUTs.
What's the second amp going to do in your scenario? Something other than the normal stereo channels; something multichannel (if your PC supports it); or just more speakers supported for the PC to feed?
An RCA Y-connector pair would share the stereo output of the PC with multiple Line Level destinations.
If a second amp with its own volume control is intended to share the same two channels with the SU-V500 it could also be slaved off the back of the SU-V500 wih an RCA patch pair exiting the Tape 1 or 2 REC(OUT) jacks. The second amp would receive full-volume audio from whatever source the SU-V500 is playing. Just don't activate the selected Tape monitor on the SU-V500 or you will cut off the source to both amps.
It sounds like you have lost a ground connection, It is possible this is in your connections to the input such as your input leads to the amplifier. Check very carefully the shield or negative connection at both ends of your leads (it could even be the brand or construction of the connector itself as some connectors use a mechanical joint between where the negative and ground is connected and the part that makes contact with the amps input terminals).
If this is not the problem, the next most likely is that an internal amplifier ground has been lost - this can happen if the speaker positive makes contact with the amplifiers input socket. You should use a multimeter to measure continuity between speaker negative terminal and the input ground terminal - this should read 10 ohms or less, if not you could open the amplifier and look for damaged cct board tracks etc.
If the problem has developed slowly (over weeks) you could be looking at faulty capacitors in various parts f the powersupply and main amplifier boards - replacing these is indicated if the amp is over 10 years old and or has been used in confined spaces allowing high ambient temperatures to occur.
Unfortunately can't connect it that way. The pre out is only meant to go directly into an amplifier that has all of the same inputs (front/rear, center and surround), not a standard receiver. (Pre amp to amp only, not pre amp to receiver) If your Onkyo doesn't have all the same inputs as your Kenwood preamp has outputs you will just use your standard left/right outputs from the Kenwood to your Onkyo input (CD, Tape, Phono,DVD etc) then use the outputs (front/rear, center and surround) from your Onkyo receiver and connect directly to your speakers..
It goes between whatever you are using to create the sound and the input to the amplifier. e.g. for a standard HiFi.. HiFi aux out to equalizer input... equalizer output to amplifier aux input. Trying to keep left and right channels the same through out. They are usually colour coded. Red = right Left = white. Hope that helps. We all start somewhere
what to remember is pre-amp is before the amplifier then the amplifier to the speakers, go this route, Tuner for radio? from the radio tuner out go to the pre-amp tuner input, then from the pre-amp OUT go to the AMPLIFIER IN, tuner, cd, dvd, tv, any source, if you are using a 2 channel amp and pre-amp this is relatively easy, a little more detailed for multi-channel pre-amps and amps but follow the same path, sound source signal ie. tuner to pre-amp, pre-amp out to amplifier and speaker hookup to amp channels,
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.