Hammond Model A, Manual, Page: 269 / 298

2-11. Check the speaker cones for defects. Check the speaker mounting bolts for
tightness.
2-12. Inspect all pedals on the pedal clavier for cracks or breaks and for proper
tension. (Each pedal should just come up when a 3-pound weight is placed directly
behind the pedal sharp cap.) Be sure that the flat spring pushers at the ends of the
levers are firmly mounted and are properly seated in place over the pedal switches*.
Determine that the felt pad extending over all the plungers is in place and not
worn. Adjustable tension springs are made accessible by removing the cover board
from the rear of the pedal clavier. If pedals become loose and rebound when played
rapidly, increase the tension by tightening the adjustment screws*. (* = Figure 14,
Section 8)
2-13. Check the generator anchoring fittings. They should be unscrewed so that the
generator floats freely. Be sure that all suspension springs for the generators are
connected in position at both ends and are properly positioned.
2-14. Be sure that the console is located on a rigid level surface, so that the
generator mounting mechanism, anchored to the generator frame, is free to move in
any direction without coming in contact with the wooden shelf of the console bottom.
2-15. Be sure that the tone cabinet is located with the open back placed 2 inches or
more from the wall or other obstruction. Be sure that adequate ventilation has been
provided.
2-16. Check all tubes for cracks in glass or base, and for bent or broken prongs.
Inspect for firm mounting of the tubes in their sockets. Test tubes for low
emission, leakage, and short circuits. Test all tubes at least semi-annually and
replace them at least every 18 months. Inspect pins and bases for accumulations of
foreign matter.
2-17. As the Model C-3 Hammond Organ is used in chapels and auditoriums, it is
unlikely that inspection will find the organ deteriorated beyond repair, except
where it has been subjected to fire or explosion.
2-18. REMOVAL AND REPLACEMENT OF PLUCK-OUT PARTS.
2-19. VACUUM TUBES. The following instructions apply when it is necessary to remove
and replace vacuum tubes.
a. Table I lists the tube complement of the Model C-3 Hammond Organ and Model
PR-40 Tone Cabinet.
b. Never remove tubes from the amplifiers when the organ is turned on. Avoid
working on the tubes immediately after shut-down; severe burns may result from
contact with the envelopes of hot tubes. Never jar a warm tube.
c. When replacing a defective tube, do not jiggle the tube from side to side in
its socket. Movement of the tube weakens the pins in the base and unnecessarily
spreads the contacts in the socket. Replace the defective tube; be sure that the
replacement is pressed down firmly in its socket.
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