[g4wim_tim]

Hi Dave,

thanks for that, ties up very closely with my measurements.
I've adjusted the RF PA taps on the mod tranny and can now achieve 86% positive peaks and 99% negative peaks - I suspect the positive peaks are limited by HT sag.

The RF PA 61646's draw 150mA at 527V HT for 60 watts of RF out - so an efficiency of about 75%.

The KT88's draw about 90mA each at full modulation power.

So everything is looking promising - I'll post some more pictures later.

Next problem is what to do about a 6146 screen voltage clamp - all is good when on tx and the screen sits at about 200V, but with no drive it rises to 400V and even with g1 at -85V the 6146's still draw 50mA when in stby.

So it's either a 6aq5 screen clamp (like the DX100) or I remove the screen volts while on rx. Will likely do the latter as I have a spare relay contact and don't have a 6aq5 to hand anyway !

Regards Tim