Sorry to read this Paul.
Swapping the right and left tubes is a good idea but I would swap all of them, not only the WE tubes.
Does this happen no matter the inputs you are using ? Did you try swapping the cables between your source and the Giscours ?
Having a bad bias on a CC80 won't affect the preamp.
If the KT88 come from Shindo, you may not have to adjust the bias.
We have a fabulous Shindo expert in Paris.
If you need service It could be simpler to send him your Giscours than sending it to Japan. Just let me know by PM if you need him.
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There are two means of refuge from the miseries of life: music and cats
Albert Schweitzer
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