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Original Message
RE: Any approach we can make 6h30 warmer and richer?
Posted by Eli Duttman on January 30, 2017 at 07:46:31:
High gm types, like the 6n30p, are particularly vulnerable to parasitic oscillation. Parasitic oscillation at VHF or higher frequencies can cause "hard" sound. Use carbon comp. grid stoppers of substantial value and 100 ohm carbon film stoppers on the plates.