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Cary SLI-80 bias help

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?
vortrex

Showing 2 responses by czbbcl

czbbcl's avatar
czbbcl
1,752 posts
 
IMO ....Yes ..But I am not an Electrical Engineer... I use Genelax Gold Lions and bias them to 75 mA.

Chuck
czbbcl's avatar
czbbcl
1,752 posts
 
I use a Radio Shack meter to set the bias on my SLI-80. It has a mA scale and I set it to 75. Not knowing your meter and what scale you have it set on it is difficult to provide you with a difinite answer. If you are on the mA scale which it sounds like you are then 75 would be the correct setting. Sorry I couldn't be more help.

Make sure the amp is warmed up before testing for the bias current as it will tend to drift when cold.

Chuck
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