Scorch mark on inside of kneeboard: DC heater bar?

[Richard Cromwell]

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Was the DC bar plugged into a humidistat? I'm guessing no.

RC

Chptr 481

 

  _____  

From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf
Of Cy Shuster
Sent: Friday, December 10, 2004 7:16 PM
To: Pianotech
Cc: Roger Wheelock
Subject: Scorch mark on inside of kneeboard: DC heater bar?

 

Same 1969 Samick upright, different strange item.  Opened the lower cabinet
to check the bridges, and found a charred spot on the inside, about 1.5"
diameter, about 8" below the top edge of the panel.  It was circular, with
indications of heat rising upwards from it, and was absolutely charcoal in
the center, burned in about 1/4" (I'm surprised it didn't show through the
panel).

 

Hanging right across from it was a typical 25W shiny chrome pushpin DC bar,
unplugged at the time.  This is the only conceivable source for heat coming
from *inside* the piano -- yet why would it create such a small heat spot?
Do they get hot in one spot when they burn out, like a fuse, perhaps?  (I
didn't check if the bar still works.)

 

That burn mark was very scary looking...

 

--Cy Shuster--

Bluefield, WV

 


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