Spring Line Hum

[Paul Perry]

At 08:08 AM 16/07/00 +0100, Ken MacBeth  wrote:

>but have always encountered the inevitable background
>hum, sadly in the past, this factor has always stopped
>me using springlines in general. 

I did hear once of someone using 2 lines next to each other & out of phase 
as a kind of 'humbucking' setup. Dont know how successful this wd be,
quite apart from the fact that combining signals from 2 very similar
lines might have some weird byproduct.

Perhaps it wd be possible to have a small magnetic pickup at almost the
same point & try to get a pure sample of the hum & then adjust phase & 
amplitude to cancel it out when mixed with the output of the spring pickup.

I presume that the magnetic field from the nearest power transformer is
 doing the damage. In domestic organs, you sometimmes see reverb tanks 
mounted in strange angles and places, for this reason. 

paul perry melbourne australia