INSTALLATION OF FLUID TYPE
In installations of tone cabinets using type F, type G, and type H power amplifiers,
only a single reverberation unit is necessary for any installation, regardless
of the number of tone cabinets used. The reverberation unit is connected to the
first power amplifier (the one to which the console cable connects) and the
reverberated signal is supplied from that amplifier to additional cabinets.
An exception occurs in the case of type HR-40, KR-40 and JR-20 tone cabinets,
in which no reverberated signal is available for additional cabinets (because of
the separate bass and treble channels). If reverberation is desired on several
H, J, or K series cabinets, each must be equipped with a reverberation unit.
When two or more types of cabinets are used in any installation, it is preferable
that any H or K series cabinets be connected to the console ahead of any cabinets
having type F, type G. or type H amplifiers in order that reverberated signals may
not enter the bass amplifier channel. Otherwise there may be objectionable
irregularities in the response of the lower pedal notes. Further information on the
use of reverberation may be found in the section covering Acoustics.
FILLING AND ADJUSTMENT OF FLUID LEVEL
When installing a reverberation unit or tone cabinet, the damping fluid (furnished
in bottles with the unit) should be added with care, following directions on the
tone cabinet instruction card. The level in the three long tubes is not critical;
for best damping it should be near the top. but not high enough to spill if the unit
is moved. Enough fluid is furnished to fill each tube to about one inch from the
top.
The short tube should be filled to exactly 3 -1/4 inches from the top, using the
special suction bulb supplied. This amount of fluid gives the best reverberation
effect for average conditions.
If acoustic conditions are very unusual, or if an organist has a definite preference
for greater or less reverberation, the level in the short tube may be set higher or
lower. Lower fluid level will give longer reverberation time and higher fluid level
will give shorter time. There is a temperature effect due to change in viscosity of
the fluid (lower temperatures will shorten the reverberation time and higher
temperatures will lengthen it) but no adjustment for this effect is necessary unless
the temperature is consistently below 50 degrees F or above 95 degrees F.
The reverberation selector switches are set at HI when leaving the factory. and
should be readjusted on installation to give the most desirable reverberation
effect. If there is any uncertainty as to the proper adjustment, it is generally
preferable to allow too much reverberation rather than too little.
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