Very nice. I couldn't find the 150 on this site, but if it's like the 160, it probably uses paper caps in the filter section (note the values). With those values some hum is normal, and those caps don't deteriorate capacitive-wise. They only get leaky and short out, which could possibly cause hum. Otherwise, if they are not leaky, then the radio always had that hum. Those radios did tend to hum a bit more due to the small value caps. Note in the schematic of the 160 the capacitor labeled as E. If your set has one of those across a choke, omit it when re-capping the set (unless you use all original values for the filters). When you re-cap, you can use electrolytics. Go with higher values, around 10 to 16 MFD. Hum will be greatly reduced. I had to build an entirely new power supply for my Majestic 180 (separate power supply). I used 16 and 30 MFD units, and now the set has almost no hum. It's great. Your speaker is a bit different than mine, but if it uses the rubberized cloth surround on the cone, you can greatly improve the bass response by replacing the hardened surround with new rubberized cloth or thin suede.
T.