I've been using both. They are stable and quiet. The 1223 is over 30 years old and never a problem. The fan in the 1235M was acting out a bit and I replaced it with a high quality computer fan. The fan runs more than I would like but it is reasonably quiet. The 1223 is now on 24/7 to power my IC-7300 for remote operation. Both are rock solid.
73, Doug -- K0DXV
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