shortwave low power transmitters

[radio pamela]

Does anyone know where i can obtain a all transistor shortwave transmitter for 48 to 41 meter band around 5-10 watts , i have built a 12 watt valve rig but as is mobile runs off 12 volt car battery to run the 400 volt inverter i can only keep it on for 3 hours max , so a transistor rig will run longer being low power transistorised .