Hammond Model A, Руководство пользователя, Страница: 163 / 298

MONAURAL EARPHONE CONNECTIONS
Earphones can be added to the console for practice purposes so as not to disturb
others. Earphones at best cannot replace the tonal quality achieved from the
instruments' own speakers but do make the organ more available. One method of
attaching earphones is shown in the sketch below, using a reluctance type headset of
good quality. Inserting the phone plugs silences the speakers in the console. Wiring
is between the preamplifier terminals marked G and the main amplifier input.
STEREO EARPHONE CONNECTIONS
A second method of attaching earphones is given below. This will provide a
stereo effect that is well worth the cost and effort expended.
1. Turn over AO-39 chassis and disconnect two black wires from the BN-BK speaker
terminal inside of the amplifier. Leave output transformer lead connected. Connect
the two wires removed, to the center lug of the three lug terminal strip nearest the
front of the chassis and solder connections.
2. Replace amplifier and place a solder lug under the mounting screw nearest the
output transformer.
3. Remove the brown wire from the BN-BK speaker terminal on the AO-39 and solder it
to the lug just installed.
4. Remove the green wire from the GN speaker terminal on the AO-39 amplifier and
splice on an additional length of wire long enough to reach the earphone jack and
switch which will be mounted on the front of the console.
5. Solder a wire to the GN speaker terminal on the AO-39 long enough to reach the
earphone jack.
6. Solder a wire to the BN-BK speaker terminal on the AO-39 long enough to reach the
earphone jack.
6