Posted by Wayne Parham [ 70.234.129.180 ] on June 25, 2007 at 18:18:50:

In Reply to: Eico HF85... "persistent hum" posted by kraken on June 23, 2007 at 09:47:46:

Disconnect the output from the HF85. Is the hum still there? If so, it's the amp, not the preamp.

Now disconnect the input to the HF85. Is the hum still there? If so, then it may be power supply hum or something else internal to the HF85. If not, it's the source. Check your ground, cables and source equipment.

Grounding problems are very common, so make sure your ground is good.

Replies:

• Re: Eico HF85... "persistent hum" - kraken 13:14:15 06/29/07 (3)
  • Re: Eico HF85... "persistent hum" - Wayne Parham 14:33:12 07/01/07 (2)
    • Re: Eico HF85... "persistent hum" - kraken 15:26:11 07/01/07 (1)
      • Re: Eico HF85... "persistent hum" - Wayne Parham 23:16:09 07/05/07 (0)