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Power problem sounds like an intermittent in the wiring somewhere between the plug and the transformer primary. With it unplugged check with ohmmeter across the power switch turned on and off several times, check all associated wiring for continuity. Wiggle wires while checking with ohmmeter. Switch could be "iffy."
Often a "putt-putt" sound points to a bad cap. You replaced one electrolytic. The other may be "injured." Try jumping another one across it as a test. Be sure to observe + and - on these caps. The designation on the cap can be confusing. The aluminum can is the negative, and the positive is the wire coming out of the insulating disk.
Hum pickup: with volume turned up part way, you should get a hum from speaker by touching center lug of volume control, or grid of the 6SQ7 first audio.
Check all chassis grounds. Are any grounds through a riveted or screwed solder lug? If so shine them up and bridge solder between them and chassis. Sometimes corrosion gets in between the lug and chassis and makes noise.
Get the audio section working first before going on to the radio.
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Reece
Perfection is hard to reach with a screwdriver.
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