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Hi Eva,
I've got a 670 & we're just debating what we're going to do to get round the diminishing quality of 6386 tubes. I'm over in Glasgow, Scotland but we've got in house maintenance so building up things shouldn't be too difficult. We tried 5670s in one side yesterday & obviously there's huge change in the gain reduction & overall tonality.
We could easily do the same with your mod & record the results of each side & send them over to you. Let me know what you think.
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