DIY HiFi Forum

RE: Cole LCR Review

58.171.76.78

In Reply to: RE: Cole LCR Review posted by ChasLieb on May 02, 2008 at 18:28:29

Good logic regarding mains voltage. That was my first guess when reading the thread and Brian's comment at not being able to get the same issue.

Magnetic interference is of course due to current flow and not voltage. So increase voltage, reduce current and reduce magnetically coupled noise and hum.

I do not know the constructoin of the Cole but fixes might include using a non-magnetic sheet between chassis and transformer to increase the reluctance of the air gap between the two. Also, non-magnetic cover could be used and Brian suggested which is the best new manufacture solution.

In the short term, at OWN RISK, and for those Coles in the field with steel covers using a non-magnetic spacer and possibly bolts etc between cover and chassis to increase the reluctance again. BUT this will mean the cover is no longer earthed. It might be possible to use use an earth strap and possibly with a small value series resistor to reduce the hum currents.

Again the suggestions are based on limited knowledge to the Cole. The non-earthing of the cover (and for that matter the earth link of the Cole) must be carefully considered as safety is reduced. Likewise I assume the issue lies with the power transformer and not associated wiring. Is it possible to put some form of internal magneitic shielding? Not always easy would depend on space and a new cover might be more practical.

Cheers

Richard

Follow Ups:

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.