Greg Hanks Design BA-660 Operation And Service Manual Download Page 2

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C O N S C I E N T I O U S A U D I O D E S I G N A N D M A N U F A C T U R E

Use and Care of your Mic Pre/limiter

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Greg Hanks Design

35 Hardscrabble Hill Rd.

Chappaqua, New York 10514-3009

(914) 238-4172 FAX (914) 242-0282

Summary of Contents for BA-660

Page 1: ...GREG HANKS DESIGN BA 660 Operation and Service Manual Issue 1...

Page 2: ...C I E N T I O U S A U D I O D E S I G N A N D M A N U F A C T U R E Use and Care of your Mic Pre limiter Greg Hanks Design 35 Hardscrabble Hill Rd Chappaqua New York 10514 3009 914 238 4172 FAX 914 2...

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Page 4: ...put 8 Chassis Gnd Green Post 8 Signal Gnd 8 Power Input 9 CONTROLS FRONT PANEL 9 48 V 10 Input Selector 10 Input overload LED 10 Insert Bypass 10 Input trim 10 Phase reverse 10 Meter zero 11 Limiter T...

Page 5: ...ng type plug a plug having a third grounding pin This plug will only fit into a grounding type power outlet This is a safety feature If you are unable to insert the plug into the outlet contact your e...

Page 6: ...z 0 1 S N Ratio 120 db Output Impedance Line Out 20 20Khz 100 balanced 50 unbalanced Insert Send 100 Phantom Voltage nom 48VDC Internally adjustable to 300 VDC 5 ma Attack Time 200 s to 150 ms Release...

Page 7: ...l Put the monitor select button in the Out position Set the output gain makeup control for around the yellow LED Line level use Plug the Line level signal into the input of the BA 660 Set the monitor...

Page 8: ...BA660 doc 01 01 97 5 of 25 This page intentionally left blank...

Page 9: ...level is between 10 and 14 No provisions are made for phantom power and system will accept balanced or single ended signals Shield is expected to be served by the driving source and is internally lif...

Page 10: ...stortion or noise Care must be take however to select the correct polarity to be grounded with the Un Balance switch on the rear The ground will be taken at the output of the unit and should not be ta...

Page 11: ...hematic diagram for the appropriate switch settings outside of the US Controls Front panel 100 VAC 120 VAC Default 220 VAC 240 VAC INPUT SELECTOR INPUT TRIM METER ZERO LIMIT TIP IN CAL Gain Reduction...

Page 12: ...oom Insert Bypass Provided at the rear panel is the output of the preamp and the input to the gain cell These signals isolated from the main signal path with high voltage op amps When the insert point...

Page 13: ...urce for the Audio Meter ing When depressed me tering of the input gain stage is accomplished and when it is out the meter is looking at the output of the unit as it feeds the outside world 0 is equal...

Page 14: ...ng rock and roll faster release times allow for pumpier sound For minimum signal degradation setting around 12 O clock work best for most music Again the grayed out regions should be avoided by all bu...

Page 15: ...s not really an issue nor is it that important Our only real concern is being able to control the gain with the dynamics that we find audibly pleasant as well as having the output level be within reas...

Page 16: ...ncept of open ness The robust characteristics of the gain cell make it easy to squash the crap out of a good sounding dynamically alive signal and make everything sound like an AM radio mix This is no...

Page 17: ...for no gain in the gain control cell There is no provision for gain change as in most compressors and this unit only provides for program controlled attenuation of the signal path As such when you inc...

Page 18: ...ly to Tech Earth internally The link that is provided external to the chassis is the only point that the chassis and Tech Earth Audio Com mon are brought together This connection must be maintained ei...

Page 19: ...ground current sensing and should not drive ground This WILL oscillate when driving ground DANGER Fuse location and Input power voltage selection The fuse is located directly behind the IEC Power inp...

Page 20: ...hematic sheets The basic function is indicated by the name of the sheet The circuitry is unique as it fully balanced from input to output both internally and externally The signal paths for the and th...

Page 21: ...approximately 500 ms Because of this muting action the input selector nor the preset switch should be used after initial setup when employing this unit for live broadcast Insert Sends and Returns The...

Page 22: ...hunt element What this means in layman s terms is that the conductance of the vacuum tube i e resistance is a function of the ratio of the Cathode current to the grid bias If you will look at sheet 7...

Page 23: ...The release time is also determined via a log converted charge pump which resets the past memory of the average signal level at a fixed recovery time The objective was to provide transparent gain cont...

Page 24: ...NS There are no express warranties except as listed above GREG HANKS DESIGN SHALL NOT BE LIABLE FOR SPECIAL INCIDENTAL CONSEQUENTIAL OR PUNITIVE DAMAGES INCLUDING WITHOUT LIMITATION DAMAGE TO TAPES RE...