Hello. I have a 5100 (not B) transmitter that I use almost daily for CW and AM phone. Ever since I've owned it I've had a nagging problem and it has me stumped. When you flip the transmit switch to transmit, either phone or CW, the power slowly rises to full output and plate current. Now this takes a few seconds to occur. Starts out about 60 or 70 watts and over about 10 seconds goes up to full 110 watts if loaded heavily. I have swapped the 6146 tubes and no change. Just looking for a suggestion on where to start. I am very experienced with working on old tube gear just getting too old to actually pick this thing up and carry it to the lab (90 + lbs). So I'm looking for some good suggestions before I call in a favor to help carry it.