I purchased a used SLI-80 with upgraded Shuguang Treasure 6CA7 Z power tubes. I decided to check the bias, which Cary says should be 75-100 mA per Channel. Using my GDT-11 meter I put the dial on the A-- portion and selected 200m. When I get the reading it is saying 4.5, obviously far off from what Cary suggests. Am I doing this wrong or is it really that far off? I don't know what effect that would have, but the amp sounds OK as is. I'm worried about truly putting that number at 75-100 in fear my reading is not right. I used this same meter though (it's brand new) to bias my Jolida amp and it was fine. Is 4.5 really 45 in this case?
Ok Wikipedia says it's in the el34 family. My Svetlana el34s biased just fine at 75. It requires a very fine touch as it overshoots or undershoots easily.
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