When you do your test you first need to make sure the resting AGC bias voltage is properly set (Rcvr Sensitivity) then set s-meter to 1 ?Then make your test.?
?
Then after substituting the 6AH6 tube for the 6HS6 you need to recheck the resting AGC voltage again because as it may need re-adjusting as well as the s-meter reset to 1. Otherwise it will not be a fair test.?
Donnie / WA9TGT
DONNIE WA9TGT