YOU ASKED:
>For my own information:
>
>Average total tension of normal piano at A440 is____?___lbs.
>
>Average total tension of normal piano when 50 cents low =_____?____ lbs.
>
>Average total tension of normal piano when 100 cents low=_____?____ lbs.
>
>
Below are tensions given without taking any stretch tuning into account -
close enough for customer information. If I (and the computer) did not do
the math correctly, the COMPUTER will stand correction? I trust that the
columns will come through OK and not scroll out of line when you receive
this data.
APROXIMATE OVERALL PIANO TENSION INCREASES/DECREASES FROM A440/C523.251
Based on an overall tension of 36500 pounds at A440, an approximate average
of upright pianos.
Pitch down from A440 or C523.251 Pitch up from A440 or C523.251
A440/ From From From From A440/ From From From From
C523 A440 A440 C523 C523 C523 A440 A440 C523 C523
CPS cents pounds cents pounds CPS cents pounds cents pounds
flat flat decrease flat decrease sharp sharp increase sharp increase
1 -4.0 168 -3.4 143 1 3.8 160 3.2 135
2 -8.0 335 -6.8 285 2 7.6 321 6.4 270
3 -12.1 506 -10.2 427 3 11.4 483 9.6 407
4 -16.1 672 -13.6 568 4 15.2 646 12.8 543
5 -20.2 841 -17.0 709 5 19.1 814 16.0 680
6 -24.2 1006 -20.4 850 6 22.9 978 19.2 818
7 -28.3 1174 -23.8 989 7 26.7 1143 22.4 956
8 -32.3 1336 -27.2 1129 8 30.5 1308 25.7 1099
Cents Pounds Cents Pounds
Flat Decrease Flat Decrease
-5 210 -110 4355
-10 419 -120 4724
-15 627 -130 5089
-20 833 -140 5450
-25 1039 -150 5807
-30 1243 -160 6159
-35 1446 -170 6508
-40 1648 -180 6852
-45 1849 -190 7193
1/4 tone -50 2048 1 tone -200 7529
-55 2247 -210 7862
-60 2444 -220 8191
-65 2640 -230 8516
-70 2835 -240 8838
-75 3029 -250 9155
-80 3222 -260 9469
-85 3413 -270 9780
-90 3604 -280 10087
-95 3793 -290 10390
1/2 tone -100 3982 1 1/2 tone -300 10690
Al Jeschke
Jeschke's Piano Service
Calgary, Alberta
This PTG archive page provided courtesy of Moy Piano Service, LLC