Amp speaker connection problem

[ellal]

Got an old technics amp - the same one as here

It's developed a new problem as regards the speaker connections.

I lost the left channel so did the usual of changing speakers around and swapping cables etc.
The sound comes back on if I don't clamp the wires, but drops out after a while so I have to wiggle the cables again.
The strange thing is it does the same thing irrespective of whether I use Speaker A or Speaker B connections.

I know some may say bin it, but having adjusted the tone controls it still sounds (to me) really good with my setup.

So any suggestions as to where I start with trying to solve the speaker connection problem?

 

[Wayners]

Make sure everything is unplugged. No mains power.
Buy a cheap multi meter.
Continuity test each wire to speaker connector and shake wire a bit.
If wire is good you hear a continuous sound.

Use to find the break in connection if you have one.

Next pop open case on amp and test the connectors. Should get a continuous sound again. All simple stuff. Loads on YouTube showing you how.

Look up continuity test

 

[ellal]

Cheers.

Got a continuity meter and tested the cables before swapping over.
Not keen on going inside the case, but will have to.

 

[jj4091]

Put some de-oxit in the terminals and try again.

 

[flameport]

So any suggestions as to where I start with trying to solve the speaker connection problem?

The terminals themselves
Where those terminals connect to the circuit board inside
The switch(es) that select between speakers A and B.
The protection relay which switches the speakers on after a short delay.