Lost left stereo channel from amp. All speakers / wiring ok Technics SU-V6 amplifier. Wondering which component is most likely problem so I can cannibalise another amp.

Being a 500W amplifier, you need to connect speakers with 300W each. The correct method to connect speakers is red terminal of speaker should be connected to red terminal of amplifier & black to black. The left side to left side speaker & right to right speaker. There may be main & remote terminals. Main speakers are the speakers at local place of the amplifier & remote for remotely placed speakers. I do have Technics SU-V85A which is somewhat similar. Enjoy! A nice piece to listen.

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.

There are three possible problems with your system. The first, and cheapest to fix, is that the wire connecting the left channel is faulty. To test this, unplug the wire from the back of the amp and put a new one in, then play some music BEFORE putting everything back into it's respective place. If the speaker doesn't cut out anymore, problem solved! Speaker wire is very cheap too. If the problem persists, try connecting one of your other speakers that you know works to the input. If that speaker cuts out as well, then the amplifier is the faulty component. That will cost some money to repair (between $50-$150 depending on where you go, excluding the price of a new amplifier). If the speaker you know is not faulty works when plugged into the left channel, then the only other option is that the original left channel speaker is faulty. This could cost between $25-$100 to get repaired, excluding the cost of a new speaker. It will not be as costly as a new amp, but will definitely cost more than a new speaker cable.

If you have lost the channel on all functions IE:tape, radio, aux etc. Then there's nothing wrong with the back connections. The good thing about stereo amps is that it uses the same parts for one channel as it does for the other. Which in your case means that the left channel can be used for a guide to the right. The first thing to do is look around the amp. Find the two channels parts and compare them, first by looking at them. If you find one burnt and the other good, you have solved it.
As long as you keep away from the power supply parts, you can touch them with an insulated screwdriver. A buzz means it's working and if you work backwards from the speaker section, poking parts with the screwdriver you should be able to find the cause of the problem. Remember use the left channel as a guide to what happens in the right.

usually meens it is protecting itself from destruction
check your wires and speakers for problems

You can try replacing the resistors. They are available using part number: ERDS1FJ100 from tritronicsinc.com for $1.10 each. Typically though, the reason for the silence is a defective output amp-pac. This too can be purchased from tritronicsinc.com using part number: RSN3305-P for $65.73. This is the amp for the front speakers. The rear and center speaker5s use part number: SVI3205B which is listed as no longer available.

Hope this helps,
Dan

first dose your amp have 2 or 4 outputs if 4 outputs you have to have 4 speakers ,and connect them on your amp speaker output is that so hard to do ....

test you speaker maybe there is a bad connection some where is the spk. box its self ,try changing speakers left to right .
it the spk. are ok open amp see all the connections within the amp .
if this dose not work contact me by mail: [email protected]

That is a common symptom of not properly grounding of negative side of the output of power amplifier section.Just resolder all component parts joint in power amp.sectiton and double the solder all negative ground.Also clean the pots of all volume controls and selector with a lighter fluid or desame that fluid so whatever sound or crackling noise eliminated and works normal again.. Hope it may help you;;

THe amp has detected a problem and shutdown to prevent further damage. This unit has 2 amp pacs inside and one or both have failed. If you can solder, you can fix this yourself. The main amp pac is an SVI3206 and can be purchased online for about $60.

Keep me posted.
Dan