I acquired a Heathkit HA-14 along with the Heathkit HP-24 power supply. I bought the PM-HP24 kit from Harbach Electronics to upgrade the power supply and plan to do a few mods to it to improve and make it safer to operate. If you look at the pictures below you will notice a SK-201 soft key by Harbach Electronics board for a SB-200 that I adapted for the HA-14. Future mods for the HP-24 are the 120V soft start board by Harbach Electronics, a 12VDC feed instead of a 120VAC for the power switch that will instead operate a relay in the PSU to power on and off.