I have a Yaesu ft-102 Transceiver. It has the AM/FM Board installed. The trouble I am having is on AM with low transmit output power. Yes, it is on 11 meters. On SSB after tuning up on transmit I am seeing 100 watts output according to the manual is right. When I am on AM I have my carrier set at 20 watts with Modulation I am only getting 60 watts output? I have neutralized the 6146B tubes and also adjust T1005 in the RF unit for full output power on AM. I was thinking maybe the stock driver tube is weak? All tubes are original as far as I know. Any ideas where or what might be wrong would be greatly appreciated.