Hello everyone! First thank you to all. I got the heater re-wired to the proper 6v series on 2 sets of 2. PIECE OF CAKE! Plugged in new 6LF6 tubes. And hit the switch.... Everything came up normal. Heaters on looking good! I let it sit idle maybe 10-15min (did some research today and found some people let new tubes sit idle for an hour or so) Tuned up the Kenwood, then followed the instructions for the Swan. I have to say the instructions are very simplistic for this tuning compared to the Kenwood Hybrid. Tune for max smoke pretty much. Not very "technical" in comparison. But I see this seems very common for PA's of this nature. Anyway, unfortunately I now have LESS power out. **insert trombone whaa whaaaaaaa** I have a Heathkit HM-2140 measuring power and SWR For reference... with 8950- 20m-500 15m-400 10m-90 (weird) With new 6LF6 20m-400 15m-320 10m-50 (really?!) SWR 20m -1.5 15m-1.6 10m-1.5 So I'm either doing something wrong, or something is hurt in the amp itself. Probably not that far of a stretch. Any tips or suggestions where to look would be great. Thank you again!