Equipment information

Orban 106C Effect Processor
Manufacturer:
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.

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Service and User Manual
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

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