Hello. I have a DC coupled cathode follower to a paraphase inverter who work well with ecc82, 12au7, 12bh7. in cf position. Just I tested with some ecc99 and get terrible buzz. I rolled 3 different pcs in the socket an the issue is pretty consistent. As fact I noticed connected my dmm over the v1 plates (v2 grids) the noise is gone completely if dmm is conected into second plate of v1 and reduced almost complete if apply dmm in first plate of v1. Any suggestion to cure the noise using ecc99 please ? I remind with 12bh7 or 12au7 the noise is not existent. Thanks
Late edit: solved !
Late edit: solved !
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