[sdiy] demagnetising spring reverbs

[Needham, Alan]

I think the transducer contains a permanent magnet for the pole piece to
react against - a demagnetiser would be bad voo-doo!
How about driving the spring line with a fairly powerful sine wave -
50Hz to 500Hz, it will probably make little difference, deliberately
overdriving just make the signal fade out very slowly - over 20 or  30
seconds. I think that would demag the pole piece without too much risk
to the magnet.

Anybody agree? Disagree?
	Alan


| -----Original Message-----
| From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
| bounces at dropmix.xs4all.nl] On Behalf Of Eric Brombaugh
| Sent: 12 May 2010 14:36
| To: synth-diy at dropmix. xs4all. nl
| Subject: Re: [sdiy] demagnetising spring reverbs
| 
| I wonder if a tape head demagnitizer would work?
| 
| Eric
| 
| On May 12, 2010, at 3:04 AM, James Dunn wrote:
| 
| > Hi list,
| >
|<SNIP>
| >
| >> ...but you must be very careful, because overdrive causes the small
| pole piece to become magnetically saturated, leading to gross
distortion
| that increases with decreasing frequency
| >
| > So my question is how can I demagnetise it or otherwise repair the
tank?
| I know there was some discussion a while ago about repairing tanks,
but
| not specifically demagnetising...
| > On the other hand, should I just buy a new tank? Where can I get
one?
| >
| > many thanks
| >
| > James
| >

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