KLP1 and K5581 Has a Speaker Channel Down

[JohnG]

I,m so rusty when it comes to thinking about the basic investigations to identify a cause of the loss of the Speaker channel.
I have just set up the KLP1 and K5881, for the first time in a very long time.
I have little confidence in believing my swapping cables is showing the cause of the lost channel.
Could a kindness be offered in supplying a sequence of tests that would help isolate the failing component.
I am not a multimeter/soldering iron using type of person, so I am hoping to be able to identify the component in need of a visit to a local cleverer person than I
Looking forward to kicking myself, when I start recalling some of the advice offered.

[JohnG]

I,ve just plugged the CD Directly into the Power Amp, and both speakers are functioning fine.
I,ve checked every source and only one channel is operating.
I am based near Mildenhall Suffolk,
Is there anybody in the Suffolk/Norfolk/Cambs region who could have a look at a repair on the Pre Amp for me.

[Richard]

Hi John,

Suspect a dry solder joint or disconnected wire, a bad interconnect cable, a bad switch (try all input positions), or a bad valve;

swap interconnects across channels,

clean the valve pins and swap the valves between channels to see if the fault follows or not.

Have a good look around for any disconnected wires and generally compare the good channel with the faulty one on all inputs

[JohnG]

Thank you richard, I will begin to familiarise myself with these actions.

[bob orbell]

Hi John, if you can't sort it, you are welcome to pack and post it to me for repair, there will be no charge to you, except any parts and return postage, I am in Kettering Northants. BOB

[JohnG]

Thank You Bob
Your offer is very kind and I may have to take you up on it.
I will see my movements over the next few weekends, and see if I can avoid the Posting of the Package.