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On your material adjust the attack and release settings to catch the peaks of the vocals. I have used the ClassA_U with a drastic compression setting:Â Ratio, 6.3:1; Attack, 16.0 ms; Release, 11.0 ms; Threshold, -33.0 dB; Gain, 7.0dB. This program supports a batch processing to save your time. It is the intent of this article to explain compressors and the process of compression so that you can use this powerful process in a more creative and deliberate way.
Revision E (AKA âBlackfaceâ)
The compressor behaves in the conventional manner when both inputs are supplied with the same signal. Design Date: 6/20/67 Serial Numbers: 101-125 Faceplate is brushed aluminum with blue paint and red power light Original 1176 designed by Bill Putnam for broadcast use, class A design Signal Preamp: Used FET (field effect transistor) in a voltage divider configuration for gain reduction, a technological first Used FET as voltage variable resistor to control the gain Used âT-padâ resistive attenuator to drop the input voltage Input Stage used a 600 ohm input transformer Used FET followed by bipolar transistor as preamp Output amp used essentially the same circuit as in the preamp, but followed it with a 2N3053 operating in class A Output transformer was the UA-5002; this transformer has split secondary, tertiary winding for negative feedback, emitter winding; the design was basically that of the 1108 preamp A Weston meter is used Design Date: 11/20/67 Serial Numbers: 125-216 Changed several resistor values in signal pre-amp stages; this improved stability as well as noise Circuit added bypass cap around the resistor feeding the gain reduction FET to improve stability Design Date: Not indicated Serial Numbers: 217-1078 Replaced FETs in the signal pre-amp with bipolar transistor (2N3391A) Tapped off of the emitter of the first transistor in the input stage; this provides a replica of the input voltage to the voltage variable resistor Design Date: 1/9/70 Serial Numbers: 1079-1238 Faceplate is anodized black Low noise âLNâ circuitry was added in the signal preamp; this reduces DS voltage on the gain reduction FET and keeps the FET within its linear range Modification to program dependency tuning Trimpot added to feedback circuit of audio FET, to minimize distortion The LN circuitry was built in a module that was encased in epoxy to protect the circuit A Modutec VU meter is used, with two lamps mounted above Design Date: Not indicated Serial Numbers: 1239-2331 Adds “UREI” branding to existing Universal Audio branding The LN module was no longer used and the circuit board was redesigned to accommodate the LN circuitry on the main board Design Date: Not indicated Serial Numbers: 2332-2611 A switch was added to change between voltages Design Date: 3/15/73 Serial Numbers: 2611-7052 Output amplifier changed to a push-pull (class-AB) configuration from the original class-A design Output transformer is changed to the B11148 type with 12 dB of gain (same transformer as the LA-3A) Push-pull design provided more output drive, and was based on the 1109 preamp Changed the metering circuit to an op-amp following the meter FET, instead of balanced bridge transistors Design Date: Not indicated Serial Numbers: 7053-7651 Removed the input transformer, and replaced it with a differential input op amp stage Removal of program dependency Design Date: Not indicated Serial Numbers: 7652- 8000+ Faceplate is brushed aluminum with red âOffâ button; this is the only revision with a blue UREI logo Removes Universal Audio branding VUi meter is changed to Modutec “light box” type, with two internal lamps Design Date: 4/1/2000 Serial Numbers: 101-1959 The new Universal Audioâs first product releaseBased on the most beloved revisions C, D and E â most similar to E, due to 110/220 switchable power transformer Serial Numbers: 1960-2946 When Clarostat T-pad input attenuator became unavailable: Changed from 600ohm T-pad to 1Kohm log taper input attenuator (same configuration in 6176 and 2-1176) Changed 012 Magnetika to Cinemag input transformer (same configuration in 6176 and 2-1176) Serial Numbers: 2947-present When original 600ohm T-pad input attenuator became available again under Precision Electronics: Resumed production with T-pad attenuator Resumed production with 012 Magnetika input transformer Revision AE “Anniversary Edition” Design Date: 6/04/08 Serial Numbers: 001-500 Faceplate is black anodized with blue paint Unique Rev. Learning to use an audio compressor in today’s home studio is one of the most important steps you can take to improve your music productions.