Re: LF: W1VD amp help - finally some progress!

[N1BUG <paul@n1bug.com>]

Today I verified board connections again, including power to the
driver IC (tnx Luis). With the scope I checked +5v and +12v power at
IC pins while operating to be sure it is clean. All looked OK.

I replaced the timing capacitors with recommended ones (tnx Jay). No
change.

I replaced resistors in the timing circuit with closely matched ones
of a different type or at least different manufacturer. No change.

I added bypass capacitors at all +5v and +12v pins on the ICs. No
change.

I replaced the 10 ohm resistor / diode on each gate lead with 20 ohm
/ diode. Finally some change! First peak of the ringing is down from
62V to 45V. This is with 12.5V drain supply. Current consumption and
power output are down about 5% but efficiency remains the same as
before.

Looking very carefully at my scope patterns and the one Jay provided
a few days ago, I still believe my gate voltage drops much more
slowly than his. I don't know why. If my gate voltage would decay as
fast as Jay's, I think the FETs would not cross conduct.

I don't know what to do next. Is there any way I can speed up the
gate turn off? Can it be the 1N4148 diodes? Mine are of unknown age
from a large batch I got quite some years ago.

Paul