[HAM] New Hammond Factory Sound / Recapping etc.

[Kon Zissis]

Hi everyone.

Mike Casino wrote:
>I wonder if this is the reason for the occasional magical sounding
Hammond
>console -3?

My friend Ray Vanderby's ( Cosmic Nomads organist and leader ) recapped
1959 C3  sounds very nice  but if you look at the TG output curve in the
TG spreadsheet,   the output levels in the TG notes 49 to 91 are uneven
with peaks and dips all over the place  instead of a smooth consistent
curve that would be expected from an organ that was accurately
calibrated according to the factory calibration specs. It is possible
that the best sounding or the most pleasantly distinctive sounding
organs with a unique sounding character have a TG output curve which
does not have a theoretically "correct" looking smooth output curve
without any peaks or dips. I have tried out the  theoretically
''correct'' looking TG calibration  curve  with my 1962 C3 but this did
sound a little thin and now that I have a non stock TG calibration
curve my C3 sounds better with a smoother and warmer sound. 
Of course in all this the tolerance differences  in  the  manual
tapering resistance wires and the  tolerance differences in the
components of the AO28 preamp and the Leslie may also be factors that
help to produce a magical sounding Hammond.   


Ian Hooper wrote:
>.105, or .255 mfd implies are lot closer tolerance than 20%. Maybe the
rules of the game were different back then, but >when I spec parts for
production, .1 mfd and .105 mfd are most definitely not the same animal,
the latter being a %5 >or better part.  Maybe it's time to open up the
whole 'ESR' can of worms again :) In such low
>impedance circuits, certainly a factor to be considered.

Paul Peters wrote:
>Hammond used four when checking caps. That means the 20% tolerance no 
>longer applies. This whole cap check was to gain higher tolerances.
STOP using 
>that 20% in any speculations.