Hammond Organ Service Manual - Early Models (A,B ... - Audiofanzine

Model A consoles below serial number 995 are not equipped with busbar
shiiters except in cases where the manual chassis and pedal switch have
been rebuilt. Full information on this rebuilding may be obtained from the
Organ Service Department of the Hammond Organ Company.
Manual Wiring - Models A, AV. B. BA, BC. BCV. BV, C, CV, D, DV, E, G,
Figure 4. a wiring chart for the playing manuals, will be helpful in tracing
difficulties associated with the generator or manuals. All playing manuals are
wired alike from drawbar 2 to drawbar 8 inclusive, but the wiring of drawbars
1 and 9 varies. Column "A" shows the wiring of drawbar 1 for consoles above
serial number 17075; column "B" refers to all consoles having 82 note generators;
and column "C" is the wiring used in all earlier consoles. Column
*d" shows wiring of drawbar 9 for Model 'A consoles below serial number
2500 and Model "BC" console below 5076; column *E ' refers to all later
consoles.
These variations in wiring are designed to match the different type of
generators described in the section covering lone generators, and therefore
the various types are not interchangeable.
Manual Wiring Models -
B- 2. B-3, C-2. C-3. RT-2, RT-3, A-100 & D-IOO
The key circuit wiring for these models ts the same as for previous consoles
above serial number 17075, and so columns 'a' and 'e' in figure 4 apply.
Manual Wiring - Model M Series
The frequency chart in this section does not apply to these models because
they have fewer keys on each manual and have a slightly different arrangement
of harmonics. Full details will be found in the service booklets covering
these models-