Hi Art, How are sir. The decision to go with only one matching transformer on the output of the 45 Mhz crystal filter was based on the research that Warren Allgyer (WA8TOD) did. Here is what he had to say: "Here is what I did. I did not try with a second transformer because the results were good enough. After the IMD measurements I would be even more concerned about adding a second transformer because the Q22 emitter follower is operating at an impedance of about 400 ohms and, as such, is one of the major contributors to the IMD issue. Adding a low impedance transformer to this source is likely to make that problem worse. But I have not tested it so I cannot be sure". Now the reason for the over all decrease in power output on 40 meters on up is due to the setting of RV1 (the trimmer potentiometer used to adjust the drive level). I found that this pot was turned all the way to the maximum counter clockwise position. In effect the drive level was wide open. I never checked its setting prior to replacing the two pre-driver transistors which is an over sight on my part. With RV1 set to maximum gain the 80 meter band was topped out at 14 watts and the other bands power output significantly higher as reported earlier. I adjusted the drive control pot back until my power output meter just started to move down from the 14 watts indicated then back to the point where the output would go no higher. That turned out to be about 40% of RV1's full travel. With the drive level set properly at 80 meters the output power on the other bands came down but so did the harmonics and spurious signals on 10 meters making the uBITX FCC compliant in every aspect except for that one SSB spurious signal on 10 meters. My net results are now in line with what Allison found and published in her "RF and Gain" paper that I provided a link to in my previous post. 73s Ripley PS: Art, your TS-950 that you dropped off last week is next up on the workbench after I finish up on the TR-7 and IC 746 that I am working on now.