Might be best to email Jeff Halpern at Tone Imports and get his input
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I've the same topic here.
Did you get any answers so far?
Actually I let the WE845 run for 2 months with the same bias as the stock 845 tubes.
I needed to readjust the bias a few times.
These days I found out that the V2 WE845 can't even reach the middle line at the bias meter, although I've adjusteted the bias to max.
I don't know what to do exactly, need some help here.