Carver M1.5t Right channel dead

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I was original looking at noisy, weak channel. As it turns out, it is an intermittent channel. The other day, both channels were working for about 10 minutes. I have the service manual. The rail voltages and voltages at all transistor legs are identical between both channels without speakers or signal.
I am now tracing inputs with the amplifier unplugged. I do not have a signal generator so I am running a signal from the headphone output of my DAC. I have signal as far as the TL071 on both channels I have stopped there to check the datasheet of the TL071.
Any advice?
Thanks in advance.
 
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Since there are two identical channels, it might be better to compare measurements between corresponding locations in the two channels.

With the amp off, you can measure resistance to ground, for example. With the amp on, you could measure DC and AC voltage to ground.

Where you find some significant difference between the channels, you should get a clue about where the problem lies.
 
I have a couple of unknowns have just arisen for me.
The TL071 that is in the signal has a + and a - input, then has an output. I am very new to this and have only recently learned a bit about the inverted signal. Where is this positioned in that regard? Is the -V signal the already inverted signal or is this signal ground. Would the TL071 be one of a pair of complementary(inverted and non-inverted) op-amps? Are my questions relevant or am I way off?
 
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