B52 AT100 Gold Pin Option

These are all adjustable bias amps and all you need to check and adjust the bias is a Multimeter if you're using the B52 method. A more accurate method is to use a bias probe and a Multimeter, or our all-in-one Eurotubes "Pro One" bias probe that reads both the plate current and the plate voltage simultaneously. These are available under the "Related Products" tab.

Note: The JJ 5881's are a 23 watt tube and the B52 AT100's when run in the class "A" mode run 6L6's very hot, so the 5881's would be running VERY hot. For this reason we recommend running the 5881's in the A/B mode and biasing at 70% based on 23 watts.

You can use our Generic bias video for reference which we did on a Marshall 800 and the procedure is the same.

The video below explains the difference between bias probe types.