Because the manuals of the earlier Model A and the earlier BC organs had the untapered manuals with the 16 ohms key contact resistance wires, this would have sent very strong TG signal levels to the input of the organ preamps so therefore it is possible that the TG's of these early Model A and BC organs might have been calibrated with slightly weaker output levels and then when the Hammond factory introduced the manual tapering scheme sometime in 1937 they might also have changed the factory TG calibration curve by slightly increasing the output levels of all the TG notes.
The TG output levels of the early era organs such as the 1940’s CV's ,the B2, the C2 and a 1956 B3 have noticeably stronger complex waveform bass pedal TG notes 1 to 12 output levels and slightly stronger bass and lower midrange TG notes 13 to 36 output levels compared to the TG's from 1959 up to the 1970’s.
-Many of the recapped or mylar capped TG’s from 1959 onwards also have a similar overall output curve. By studying all of these similar output curves , l have made up a few ‘’theoretically possible factory output levels ‘’ output curves which might possibly be very close to the factory intended TG output curve. These are shown further down below.
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-The TG output levels of the early era organs such as the 1940’s CV's ,the B2, the C2 and a 1956 B3 have noticeably stronger complex waveform bass pedal TG notes 1 to 12 output levels and slightly stronger bass and lower midrange TG notes 13 to 36 output levels compared to the TG's from 1959 up to the 1970’s.
Many of the recapped or mylar capped TG’s from 1959 onwards also have a similar overall output curve. By studying all of these similar output curves , l have made up a few ‘’theoretically possible factory output levels ‘’ output curves which might possibly be very close to the factory intended TG output curve. These are shown further down below.
There is a very old output curve graph called ‘’ Approximate output voltage readings of organ generator frequencies 1 to 91 ‘’. This graph has two output curves, the first output curve is a stronger curve with a significantly stronger bass for the Model B organs with serial numbers between 4000 and 5075 that had the untapered manuals. The second output curve shows a noticeably weaker output curve with a significantly weaker bass response for the Model B organs with serial numbers above 5075 and the Model E organs with serial numbers above 8000. These organs had the manual tapering scheme.
