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60 hz hum

  1. royaaron1

    60 Cycle Hum Driving Me Batty

    I have a circuit which takes a 15VDC supply from a wall adapter. Most connections are made by shielded cables and I have employed the manufacturer's (and others) recommendations for hum reduction. Is it possible to insert a 60-cycle notch filter or other high-pass that'll attenuate the hum?
  2. Garry777

    Adcom GTP-350 PreAmp/Tuner with 60 HZ Hum

    I've had this Adcom GTP-350 solid state pre-amp for about 7 years and the 60Hz hum has gotten a little louder in the past year. When listening with headphones the hum is noticeable (both channels equaly) between songs and increasing the volume does NOT increase the volume of the hum. I opened...
    • Garry777
    • Thread
    • 60 hz hum adcom gtp-350 capicators?
    • Replies: 7
    • Forum: Solid State
  3. cwall99

    An old friend is starting to struggle...

    So I got my new copy of Art Blakey and the Jazz Messengers' Moanin' LP in the mail this morning. Dropped it on my trusty, old (hey, I bought it in the spring of 1981) Philips AF-829, and wow!!! Sounds great! Five minutes into the first track, and I get nailed with that 60 Hz tone.... No...
    • cwall99
    • Thread
    • 60 hz hum grounding wire turntable
    • Replies: 11
    • Forum: Turntables
  4. L

    Managing Expectations on Tube Amp Hum

    How much hum should one consider normal in a vintage tube amp? Would these amps have been dead silent when they were new, or did people just have more tolerance for it? I've been tinkering on and off all summer trying unsuccessfully to get the hum out of a 1960 model year Motorola console (this...
  5. L

    yet another hum elimination question

    I'm trying to eliminate a 60hz hum in a 1960 Motorola console stereo. I've replaced the power caps, the rectifier, the 12AX7s, and put in a grounded plug. I will be replacing the power tubes with a matched set of EL84s in the coming months (likely the JJ EL844s), but somehow I don't expect this...
  6. dyche01

    A hum in the Sherwood

    My current office setup is an old Sherwood S-7110B driving a pair of Mission 760 speakers. Apart from the radio, my inputs are a computer and iPad, which run through an ODAC from JDS Labs. The sound from this system was really great until a couple of nights ago when I noticed a distinct 60 Hz...
    • dyche01
    • Thread
    • 60 hz hum pre-amp sherwood s7110b
    • Replies: 6
    • Forum: Solid State
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