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If you still have audio issues, replace the capacitors to the grids of both parts of the ECL86 (or ECL82) and the one across the output transformer primary.
I have found in European sets in particular, that paper caps were crappy, and way more so than US made caps of that same era. Yet European electrolytics (especially Siemens) are usually not bad, but I change them anyway.
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"When resistors increase in value, they're worthless"
-Dave G
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