Spring Line Hum

[______________]

That would be the PAIA hot springs.

http://www.paia.com/hotsprgs.htm

Regarding the Polyfusion spring reverb -

I've built two.  It seems like when I first built them they were actually
pretty nice, but at some point they started making almost as much noise as
they were making reverb.  Practically unusable.  If someone does have a
magic solution, I'd like to hear about it!

Romeo


----- Original Message -----
From: "Paul Perry" <pfperry at melbpc.org.au>
To: <synth-diy at node12b53.a2000.nl>
Sent: Sunday, July 16, 2000 7:41 AM
Subject: Re: Spring Line Hum


> 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
>