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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.
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"If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things." -
Late edit: changing plate resistors to 100k didn't helps at all. I.ll try some grid stoppers next...
"If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things." -
More late : installed 1k grid stop resistors in each cf grids and the noise is gone. Solved, Thanks."If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."Comment
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