[Andrew B]

Thanks Hamish. I suspect there may be other issues at play in the driver/PA stage, so I'm going to isolate the PA and run a test or 2.The 50 Ohm load is a homebrew affair consisting of 20 5watt carbon resistors in a syrup tin full of cooking oil. I think I may have a "take-off" problem in either the driver or PA stage (or both), so I'll try seperating the PA stage and driving it up with an external RF source (an old CB rig).