Page 1: ...4052Current Dumping Amplifier Instruction Book ...
Page 2: ...stallation A C I n p u t Page Number Earthing Grounding F u s e s Inputconnection I n r r d s n e a le r a o n a A a l i o f I o r r d s n p k p r n r n t p r t n n O r r t n r r l I i m i t o r Ouadelectrostatic loudspeaker Loudspeaker phasing H e e c l n h n n o c A d d i t o r a L l o r d s n p a fc r s The Acoustical Manufacturing Co Ltd H U N T I N G D O N C a m b s P E 1 B 7 D B Telephone No...
Page 3: ...dayexceptfor bankholidays The map below showswhereto find us Please call 0480 52561 to tellus thatyou arecoming Clrcuitdiagramsand service datafor this Ouad productare available from the manufacturer or distributor for a smallcharge Guarantee Thisamplifieris guaranteed againstany defectin material and workmanship for a periodof twelve monthsfrom the date of purchase Withinthis periodwe undertake t...
Page 4: ...fier controlsthe loudspeakers at alltimes calling uponthe highpowersection to provide mostof the muscle The smallamplifier is so arranged it carries an error signal that providedthe largerpower transistors thedumpers get withinthe targetareaof the required outputcurrentit will fill in the remainder accurately and completely The reproduced qualityis solely dependent on the smallamplifier which beca...
Page 5: ...mountedout of sightin a cabinetor any otherconvenient location The Ouad405 2 is provided with a substantial heatsink and mustalwaysbe adequately ventilated particularly if positioned in a n h i n e t n r c r r n h n r d lf usedin closeproximity to the controlunit tuneror magnetic cartridge careshouldbe takento ensurethat hum is not induced by radiation from the mainstransformer of rhe 405 2 Thecur...
Page 6: ...operatewith the earth connectionbrokenbut investiqate furtherto ascertain the cause Fuses In addition to the mainssuppiyfuseon the rearpanelof the amplifier eachchannelis protectedby two internal fuses located on the printedcircuitboards The mainfuseis a 2 5 amp surge resisting 2 5AT typeior 2OO 250volt supplies whilea 5 amp surge resisting 5AT fuseis required when operating with 100 1 25 volt sup...
Page 7: ...ally SeePageB Whereone loudspeaker oniyis usedfor mono etther channel may be usedand the termnalsof the otherchannel leftvacant A dummy loadresisior is not required In caseswhere louospeakers suchas the electrostat c loudspeaker alsorequire an energising supplVthe instrrctions provided with the loudspeaker shouldbe followed Eachloudspeaker shouldbe capable of handling the fulloutputof the amplifie...
Page 8: ...dbe pushed firmlyhome but not soldered First withdrawthe mainsplugand thenremovethe top coverby undorngrtstwo retarnrng screws s r i d i n g t h ec o v e ra b o u t1 O m m 0 5 backwaros and liltingit clear Theadhesrve t L l t r I laD l provroed srrouid Destirckon to the amplifier to indicate thatthe limiters havebeen firted Ouad Electrostatic Loudspeaker Old Model The Ouad 405 2 amplifier shouldal...
Page 9: ...ers Headphones HeadIhones shouldbe connected to the Ouad405 2 outputsin placeof the loudspeakers and a typcal wiringarrangement is shownin Fig i Any of the headphone switchunttson the market will provide the necessary swtchingand manyof them also orovidefor rncorporating the resistors which adiustthe signallevel to suitmost magnetic headphones The Ouad405 2 cioes not require dummyloadresstors Elec...
Page 10: ...rethanone pairo ioudspeakers is to be used The switchmay be eitherof the rotary type or one of the proprietary switch boxeswhich are readily ava ila ble L O U D S P E A K E R S W I T C H I N GF O R O U A D 4 0 5 S W I T C H O P E R A T I O N O U A D 4 0 5 LT RT I Fig ii ...
Page 11: ...d distortion for various frequencies Continuous sinewave into BQ resistive load lOO Nz any levelup ro 100 wats 0 01 D tot lOOOHz any levelup to 1OOwatrs 0 01 D tot 10 000 Hz any levelup ro 100 watts O O5 D tot For otherimpedances and freqrtencies seegraphs i I voLts dBV L O A D R E S S I A N C E O H M S F R E Q U E N C Y MAXIMUM OUTPUT VOLTS AS A FUNCTION OF FR OUENCY FOF VASIOUSLOAOS E DISTOFT ON...
Page 12: ...l power limiterinserted the maximumoutput voltageis limitedto 20V 1O 50 watrs BO ail other performance figuresunchanged Output Internal lmpedance and Offset 3 3pH in series with 0 03O Offset 7mV Frequency Response Ref 1 kHz Low frequency 1 dB at 20 l1z Filterattenuation as curve Highfrequency O 5dB 20 k1z 3dB bO kHz 0 d B 10 f I t t t t i l t l l l l l l zts Low FREOUENCy tNpUT FTLTER RESPONSE l l...
Page 13: ... 1 0 k H z Hum and Noise A weighted 96d8 reffull power Unweighted 93d8 reffullpower 15 7 kHz measurement bandwidth Protection The Ouad405 2 is suitable for useunderthe mostarduous music conditlons and is electrically protectedby currentlimiters 8 5 amperes peakcurrent intoany loadreducing to 3 1amperes steadystateinto a shortcircuit Shortingboth outpLrts simultaneously for an extended periodwill r...
Page 14: ...The Acoustical Manufacturing Co Ltd HUN T iN G D O N C a m b s P E 1 8 7 D B T e l e p h o n e N o H u n t i n g d o n 0 4 8 0 5 2 5 6 1 Telex 32348OUAD G Ouad is a regrsteredtrade ntark I ...
