Hi Ludwig
Your reply inspired me to make the gate measurements - The first 4 meaurements were with the FET's in circuit but for comparison I removed Q504 and Q506 and remeasured them.? The 1.8 MHz waveforms were the same as first measured (approx 5V pk), so have not included them, but the 28 MHz waveforms were certainly different in amplitude.? (The smoother waveform at 28 MHz may be partially due to the 'scope and probe's frequency response).
I hope the file names are sufficiently descriptive.
I'll have a look at the duty cycle shortly.
Regards
Greg
