[Elecraft] Power Supply for K3s/10

[Nick - VE3EY]

I am looking for recommendation about what power supply can I use with
K3s/10 (10 watt only). The rig does not have the KPA3 brick installed.

This will be primarily a travelling rig and the weight + size is the reason
I would like to have a small switching but RFI free power supply.

I have SS30 DV and other 30A switching PSUs but they are obviously overkill
for this type of rig.

I am aware of a Kx33 PSU which is being sold for KX3 rig, but I can't tell
if its 4AMP rating is sufficient for prolonged contest use with K3s/10.

Any thoughts ?      Thanks in advance.

Nick VE3EY