Check all of the wiring connections. If the hum persists the rheostat can be replaced with a low rf emitting dimmer.
The guitar hum stops when you touch the jack because your body acts as a ground, which helps to eliminate the electrical interference causing the humming sound.
A bad radio speaker
Check your wiring. It sometimes interferes with other wires
Common causes of guitar hum include electromagnetic interference from electronic devices, poor grounding, and faulty cables. To minimize or eliminate guitar hum, you can use shielded cables, ensure proper grounding of your equipment, and avoid placing your guitar near sources of electromagnetic interference.
When you touch metal on a guitar, you are grounding the electrical interference that causes the humming sound, which helps to eliminate the noise.
Common causes of guitar amp hum include improper grounding, electromagnetic interference, and faulty cables. To reduce or eliminate the hum, ensure proper grounding of the amp, use high-quality shielded cables, keep the amp away from sources of electromagnetic interference, and consider using a power conditioner or noise gate.
It lists part hum 578 a 12.8V 10watt bulb.
While rectification pulsations are caused due to ac not being converted to dc perfectly. This causes hum (low frequency humming noise). To smooth these pulsations filters are used. Noise is an unwanted signal in the communication system.
Goldfrapp - Ooh La La
HUM
Hum?
The primary stress is on the first syllable. RAY-dee-oh. When trying to locate the primary stress, the easiest way is to hum the word. When you hum it, the syllable with primary stress will come out louder. Secondary stress will be second loudest, etc.