Thanks to all who replied and my apologies for double posting. It took a
while for this to get posted to the Amps Reflector so I also asked the
question on the eHam forum.
The problem was resolved by putting the screens to ground when the voltage
is removed. I have shunt resistors in place on each socket but the
impedance was not enough to prevent the oscillation.
Once again, thanks for the responses. I've learned a lot from this
reflector.
73, Roger
AI7RR
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