The photograph on the left is a picture of underneath the chassis with the cover removed. I have not yet had a chance to restore this unit and the the SR-400 transceiver. Right now they are in non-working condition but I hope to change that soon. When I do get finished with them I will post the pictures here. Learning from a Hallicrafters SR-150 experience I had, I will replace the diodes in the bridge circuit in the power supply.
The picture on the right is from the previous owner and shows the PS-500-AC in service next the Hallicrafters SR-400 transceiver.
Radios by Hallicrafters with Price Guide by Chuck Dachis
Hallicrafters owners manual