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#29217 - 02/02/05 11:25 AM Re: Hum in the Model 770 amplifier
painttoad Offline
Desperado

Registered: 10/25/04
Posts: 688
Loc: peoria il
i have cable for internet and dishnetwork for video,i babysat each company when they installed.made sure they grounded, watched each company put on there ground straps,then made them undo it to scrape the paint off the pipe(come on i do car installs,you don't ground to paint)anyway,due to lack of spdif inputs i have to cable swap when i want to run puter audio through the system.as soon as i hook up the puter's spdif:hum,unhook it:gone.if i hook up the puter then unhook the sat. feed:no hum.can't just unhook the cables on the sat. have to actually unhook the feed.it's strange but it doesn't bother me so much that i lose sleep over it.btw,everything is on the same circuit,still no line conditioner though.

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#29218 - 02/02/05 11:37 AM Re: Hum in the Model 770 amplifier
painttoad Offline
Desperado

Registered: 10/25/04
Posts: 688
Loc: peoria il
also i tie the puter in with my monarchy dip which is supposed to be a ground isolator(among other things)

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#29219 - 02/05/05 04:10 PM Re: Hum in the Model 770 amplifier
harlemapollo Offline
Deputy Gunslinger

Registered: 01/14/05
Posts: 5
Quote:
Originally posted by jefny:
The 75 ohm and 300 ohm converters can be purchased at radio shack and even Home Depot (at least are local one had them). The real problem comes from the cable company not properly grounding their system. Our local company, Cablevision, in my opinion did a very sloppy job in the wiring and grounded nothing. Call your cable company and complain.

In the meantime use the converters. Also, do a search on ground loop humming and you will find a number of possible solutions. This is how I got the idea of the 75 ohm/300 ohm converters.

John
smile

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#29220 - 02/05/05 04:14 PM Re: Hum in the Model 770 amplifier
harlemapollo Offline
Deputy Gunslinger

Registered: 01/14/05
Posts: 5
john i tried the ohm converters and they worked to perfection as far as the humming noise is concerned, however i did notice a small degradation in picture quality. the tradeoff was well worth it so thank you for the info.maybe when i purchase a power conditioner the hum can be removed without the use of converters. thank again.

emile

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