Petrov 125 IV noise problems

[bases-loaded@juno.com]

Patrick -

I had one just this week with similar symptoms, although it was not a
Petrov.  Turned out to be the action post at the opposite end from the
damper lifter lever rattling on it's support.  Tweaked the support up a
tad and the noise was gone.  

Hope you get that lucky...

Mark Potter
bases-loaded@juno.com

On Sun, 29 Oct 2000 08:01:28 -0400 J Patrick Draine <draine@mediaone.net>
writes:
> Dear Petrov experts:
> I have a customer with a new (3 months old) Petrov 125 IV, their 49" 
> 
> upright. I tuned it in June, shortly after delivery. He called 
> yesterday complaining about annoying rattly action noise. My 
> diagnosis based on the phone call was loose hammer flange screws, or 
> 
> even perhaps loose glue joints between the hammer/shank/butt -- but 
> that was incorrect.
> 
> I dropped by late in the day with just a few minutes to spare before 
> 
> heading home in time for various family activities.
> The noises are apparent mainly when the damper pedal is engaged and 
> the piano is being played fairly vigorously. While we can isolate a 
> few target source notes they don't generate much noise unless all 
> the 
> rest of the repetitive r&r/Bruce Hornsby/stride piano chording is 
> going on at the same time.
> If it were a grand I'd suspect damper wires vibrating slightly 
> against bass strings -- but it's an upright.
> I *did* tighten the hammer flanges, damper heads, damper flanges of 
> the (suspected) source notes, but they were already firm, and no 
> improvement occurred.
> The pedal dowels were the next suspects: the plastic/metal 
> pins/rubber contacts between the (aluminum not wood) dowels had 
> excess free play  -- BUT installing a better bushing didn't help.
> Is there something potentially funky about the damper lift rod 
> bushings? I didn't have time to pull the action, but still managed 
> to 
> get home late & have the family ticked off at me.
> The customer bought the piano in NYC to save $2K compared to the 
> local dealer; the local dealer won't give him the time of day now, 
> so 
> dropping the problem on the local dealer isn't an option.
> Besides, it *should* be the sort of thing that goes away with a few 
> tightened screws, etc.!
> Richard B, Wim, et. al. -- does the problem sound familiar?
> I'm going back on Tuesday with less time constraint, and hopefully 
> your advice.
> TIA,
> Patrick Draine
> Billerica, MA