I purchased this HP 6623A triple output system power supply for a project that never happened. The seller said that there was a hardware error on channel 1, but I haven't been able to duplicate the issue in the little bit of testing that I've done. Since I can't vouch for the unit's condition, I am giving it away--I only ask that you pay for shipping. (This thing is big and heavy, so expect a large box, 50+ lb).
I didn't have a suitable load resistor to test the full current capacity on all of the channels (I only had a 100 ohm, 100 W resistor handy). The CC and CV modes seem to work properly. The voltage and current limits can be set properly on each channel. The indicated output voltages checked out on my meter, too. I would say that this supply is "probably good," but I did not perform a full test.
If you're interested, PM me your mailing address and I'll send you a shipping quote. Item is located in New Mexico, USA.