Concert Tuning Info Emergency /accu pick up

[D.Martens]

Hi Les, you wrote:
> When using AC power, the
> > pickup hears the 50 Hz (de)polarisations too- resulting in 50Hz and
> > all its partials  being present).
> Is this true for TL as well?

It depends on your computers powersupply -
usually laptops have limited space, so often, the needed filters are not
integrated in the powersupply's circuitry. Adding a condenser yourself may
result in a blown up powersupply (and/or heavily damaged computer)
Magnetic pickups have a tendency to amplify any irregularites from the
powersource.
All kinds of things happen in ACpowergrids. Fluctuations, powersurges,
pulses intended for controlling boilers,etc.
Usually a ferrite ring arround the power cable usually does the trick, but
with a magnetic pick up it's  a  diffirent thing. A good ground connection
isn't enough.
Think of it as a guitar pickup. If you're using a powersupply with
insufficient filters, you won't get rid of that 50-60 hz noise.

Duncan
----- Original Message -----
From: Leslie W Bartlett <lesbart1@juno.com>
To: <pianotech@ptg.org>
Sent: Saturday, January 27, 2001 8:55 PM
Subject: Re: Concert Tuning Info Emergency /accu pick up


> When using AC power, the
> > pickup hears the 50 Hz (de)polarisations too- resulting in 50Hz and
> > all its partials  being present).
> Is this true for TL as well?
> thanks
> les bartlett
> houston
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