Orban 106C Effect Processor
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Model:
106C
Date:
1974
Category:
Group:
Description:
Reverberation
Information
The original Orban/Parasound reverberation generators of the
105 series represented a significant advance in the
price/performance ratio of artificial reverberation
generators at the time of their introduction. The Model 106C
which you have just purchased offers substantial refinements
in versatility of application, ease of installation, and
electrical performance, while retaining the distinctive
sound quality which made the 105 series so successful.
The exceptional performance of the 106C is the result of the
application of a number of subtle and sophisticated design
techniques to the driving and pickup electronics. In order
to use the 106C most successfully, these concepts should be
understood.
The classical problems of spring reverberation systems have
always been excessive noise and distortion in various forms.
Orban/Parasound engineering has successfully minimized these
problems by several interrelated design techniques:
—First, the spring driver coil is driven with a true
constant-current source, synthesized with an IC opamp. This
means that, compared with a conventional constant-voltage
drive, there is a 6 dB/octave preemphasis above about 250 Hz
due to the inductive nature of the drive coil. A
complementary deemphasis in the pickup Amplifier reduces
both noise and distortion products. The pickup Amplifier is
elaborately equalized to compensate for broadband spring
colorations and to simulate the coloration of a good live
chamber. In addition, adjustable midrange peaking
equalization is made available to the operator by means of
front panel controls to use at his discretion.
The pickup preamp uses an ultra-low-noise transistor in its
input stage. This device is operated in the region of 1 dB
noise factor and has been carefully matched to the pickup
coil. The resulting low noise level means that it is
possible to use the 106C in any mix, provided that the 106C
is operated at the levels recommended in this manual.
—Four springs in parallel are employed in the delay line
assembly in order to reduce effects of spring "flutter" to a
negligible level. Internal hum shielding has been improved
and the mounting configuration changed to permit swiveling
on the mounting brackets to null out any residual hum pickup
from external sources.
—The most novel feature of the 106C has been retained intact
from its predecessor. This is the "floating threshold
limiter" which helps control the characteristic spring
"boing" sound caused by signals with Sharp transients, like
drums and guitars.
The limiter circuit is an advanced FET design. Harmonic
distortion at high frequencies typically remains below 0.25%
for any degree of limiting.
Attack time is about 100 microseconds, and a dual
release-time circuit is provided.
Like any other limiter circuit, this one tends to produce
distortion on low-frequency material. Therefore, a switch is
provided to defeat the envelope risetime limiting feature
for use with instruments like organs. Even when this feature
is defeated, a conventional peak limiter is provided which
protects the spring driver Amplifier from overload under an
input overload of up to 25 dB, minimum. This is termed the
"fixed" mode.
In the "floating" mode (where the envelope risetime is
limited), application of an input signal that would tend to
overload the spring driver Amplifier will automatically
switch the limiter into the "fixed" mode until the overload
is removed. When the switching occurs, an LED on the front
panel is illuminated to indicate that the output level of
the reverb is no longer following the input level, but is
being limited.
Manual type:
Service and User Manual
Pages:
10
Size:
1.12 Mbytes (1171724 Bytes)
Language:
english
Revision:
Manual ID:
Date:
1974 01 02
Quality:
Scanned document, all readable.
Upload date:
2017 10 23
MD5:
a52ec2ed323100d789e1316f5a24ab84
Downloads:
511
Information
Registration 1
Introduction 1
Installation—Mechanical 2
Installation—Electrical 3
Performance Evaluation 3
Operating Instructions 4
Maintenance 5
Circuit Description 5 (with troubleshooting hints)
Factory Service 7
Shipping Instructions 7
Warranty 7
Appendix
Alignment Instructions 8