Interesting Problem

[Ed Richards]

Do you recognize the tune it is humming?

Seriously, It sounds like a ground loop. You don't mention your ground
set-up. Is anything grounded when unplugged? Try bonding everything
together with short heavy wire or braid and run a single heavy wire to a
good earth ground. Maybe a water pipe or a 8' ground stake in moist soil,
etc.

Regards,
Ed Richards



On Wed, 7 Jul 1999 05:55:52 -0400 MooWare <mooware at SPRYNET.COM> writes:
>Greenies,
>
>I have an interesting problem here, perhaps someone can lead me to
>what they
>think might be wrong.
>
>I have an HW101, HS 1661 speaker and  the HP23a power supply.
>
>With everything turned off.  If you place your ear next to the speaker
>you
>can hear a very low hum. If I unplug the speaker from the HW101 the
>hum goes
>away, BUT.  If I touch any part of the metal chassis or any other
>piece of
>station equipment with the center pin of the rca jack, the hum is
>very
>audible.
>
>When I turn the 101 on.  I get a very audible hum for less than 1
>second.
>then drops to the very very low level. so low in fact you would not
>notice
>it if you didn't have your ear next to the speaker.
>
>I turn the radio off, I unplugged the power cable from the 101 to the
>Power
>Supply, and unplugged the power suply from the wall.  and guess what?
>The
>low hum is still there!
>
>any ideas?
>
>Sean
>
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