[CAUT] Killer half-octave

[Bob Hull]

The first person with a pace-maker who gets near your
piano will be dead.

Bob Hull
--- Richard Brekne <ricb at pianostemmer.no> wrote:

> Esteemed colleagues:
> 
>  Hi Dave
> 
> I'm going to suggest something a bit radical... but
> very very reversable 
> in case it has no benificial effect, and will make
> for a I think very 
> interesting and easy to execute experiement.
> 
> Buy 3 pairs of 35 kilo force high power natural
> neodymn magnets. Mount 3 
> of these at even spaces under the killer octave
> area... with at least 
> one if not two on ribs just under the bridge in the
> area. Then construct 
> a beam that fits nicely inbetween the rim braces and
> mount the other 
> three so that they are exactly under the three you
> mounted on the 
> underside of the soundboard.  If you want to get a
> bit fancy you can 
> contrive this so that these have adjustable height
> screws going through 
> the beam.
> 
> You should be able to provide over around 80 kilos
> of repelling force... 
> i.e. crown support in the area in question... and
> you should be able to 
> adjust just how much you actually need if you want
> to.
> 
> I'm about to run an experiement on an older piano
> where I install a new 
> soundboard with ribs designed to provide optimal
> mass for the various 
> areas of the panel and provide the additional needed
> load support with 
> these magnets. Each magnet has around 35 kilos of
> force.  Opposing you 
> can get them within a couple mm of each other safely
> enough for the 
> application and get around 40 kilos of repelling
> force max... but in 
> practice I'd guess around 30 would be more like
> it...  However... 30 
> kilos of upwards force is a quite significant
> addition.  You add nearly 
> no mass... there is free air between the magnets so
> you are not coupled 
> mass wise to the beams....
> 
> I'm personally itching to try this.  6 such magnets
> are quite inexpensive...
> 
> Cheers
> RicB
> 
>     Our NY D, (1983) has developed - in the last
> year or so - a killer
>     half-octave from about A#5 - E6.  I've added
> some mass to the bridge
>     right under C6 and that helped a little but the
> problem remains.  I've
>     been searching through the archives this morning
> checking for any
>     further heroic measures I could take within the
> confines of my budget.  
> 
>      
> 
>     What's the general consensus of opinion about
> the "Treble Tone
>     Resonator" that Pianotek sells?  While my
> current budget precludes a
>     full remanufacturing I think I can manage the
> $155.00 for that!
>     However, I don't want to spend even that  - nor
> expend the time
>     installing it  - if it wouldn't help.  
> 
>      
> 
>     Any ideas, suggestions, experience with it
> etc.?????
> 
>      
> 
>     dave
> 
> 



       
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