Hi Ray,
Check out the review from Jeff Dorgay, who apparently did not wish to upgrade to ART 3...but he did find the GAT more compelling as i understand, having spoken with him. GAT better than both it seems. (i have never heard the ART 3). I did not find ACT 2 as sensitive to HRS/without HRS as the GAT. I wonder if 6N30P tube is less microphonic than 6922? Cannot say.
Check out the review from Jeff Dorgay, who apparently did not wish to upgrade to ART 3...but he did find the GAT more compelling as i understand, having spoken with him. GAT better than both it seems. (i have never heard the ART 3). I did not find ACT 2 as sensitive to HRS/without HRS as the GAT. I wonder if 6N30P tube is less microphonic than 6922? Cannot say.