Was there a doublespeed 15C?
Tony (Anton), a German collector, claims one of his 15C's ran his performance index at twice the speed compared to another unit.
I've just run his test on my Voyagers and have obtained the following results:
11C's: Performance Index
2711B***** : 21.9 s 1.6
2521B***** : 22.4 s 1.5
2540B***** : 23.5 s 1.5
15C's:
2547B***** : 24.3 s 1.4
2343B***** : 25.6 s 1.3
Tony's 15C, 2605A***** : 12.5 s , performance index = 2.7 !
(I have noticed the tests take up to 10% longer when using old battery sets. I used new battery sets when testing)
His performance index method may be found at:
http://www.thimet.de/CalcCollection/CalcPerformance.html
Here is the version for the 15C of his program, just in case someone want to check it out:
f LBL A
10
STO 0
f LBL B
1
+
4.567
EEX
CHS
4

70
+
69

7
*
11
/
RCL 0
1

STO 0
g TEST 0 (x<>0)
GTO B
Rv
g LOG
SIN
SQRT
SQRT
g RTN