Hafler Stereo Amplifier 9303 User Manual

9303 / 9505  
®
Insta lla tion & Ope ra tion  
®
MADE  
IN THE  
USA  
nova  
trans  
PROFESSIONAL POWER AMPLIFIER  
Download from Www.Somanuals.com. All Manuals Search And Download.  
P E R F O R MANC E S P E C IF IC ATIO NS  
9303/9505  
Full Power Bandwidth: 0.15Hz to 300kHz  
Signal-to-Noise:  
Slew Rate:  
CMRR:  
>100dB “AWeighted  
150 V/µs  
75dB at 1kHz  
+29dB max.  
Gain:  
9303  
Power Rating:  
Distortion:  
150 wpc @8 , 225 wpc @ 4, 450 Watts mono @ 8Ω  
0.07% THD 20-20Hz, Typically 0.005% THD 1kHz, at rated power into 8Ω  
800 (to 1kHz); 80 (to 20kHz); 20 (to 100kHz) into 8Ω  
Damping Factor:  
Input Sensitivity Range: 1.22 Vrms for 150W into 8, 1.06Vrms for 225W into 4Ω  
Dimensions:  
19"W x 12-1/2"D x 3-1/2"H (excluding feet)  
36 lbs. (16.4kg)  
Weight:  
Power Consumption:  
Quiescent, 84 VA; at rated power, 612 VA (150W into 8, both channels driven)  
9505  
Power Rating:  
Distortion:  
250 wpc @8 , 375 wpc @ 4, 750 Watts mono @ 8Ω  
0.1% THD 20-20Hz, Typically 0.005% THD 1kHz, at rated power into 8Ω  
1000 (to 1kHz); 100 (to 20kHz); 20 (to 100kHz) into 8Ω  
Damping Factor:  
Input Sensitivity Range: 1.58 Vrms for 250W into 8, 1.37Vrms for 375W into 4Ω  
Dimensions:  
19"W x 12-1/2"D x 5-1/4"H (excluding feet)  
50 lbs. (22.7kg)  
Weight:  
Power Consumption:  
Quiescent, 132 VA; at rated power, 1020 VA (250W into 8, both channels driven)  
– ii –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
T AB L E O F C O N T E N T S  
SAFETY PRECAUTIONS ........................................................................................................................................... i  
PERFORMANCE SPECIFICATIONS ......................................................................................................................... ii  
INTRODUCTION ................................................................................................................................................... 1  
INSTALLATION  
Location ........................................................................................................................................................... 1  
AC Line ............................................................................................................................................................ 1  
Input................................................................................................................................................................. 2  
Balanced Input: 1/4" Tip Ring Sleeve .......................................................................................................... 2  
Balanced Input: XLR................................................................................................................................... 2  
Unbalanced Input ...................................................................................................................................... 2  
Unbalanced Source with Balanced Input ................................................................................................... 2  
Output Connections ......................................................................................................................................... 2  
Monophonic Use .............................................................................................................................................. 2  
OPERATION  
Power Switch ................................................................................................................................................... 3  
Balanced/Unbalanced Input Switch .................................................................................................................. 3  
Ground Switch ................................................................................................................................................. 3  
Mono Switch .................................................................................................................................................... 3  
Load Fault Protection ........................................................................................................................................ 3  
Warm Up ......................................................................................................................................................... 3  
Cleaning and Maintenance ............................................................................................................................... 3  
Schematic Diagram .......................................................................................................................................... 4  
PC Board Layout............................................................................................................................................... 6  
Parts List ........................................................................................................................................................... 7  
9303/9505 Functional Block Diagram .............................................................................................................. 8  
TECHNICAL INFORMATION  
Theory and Operation of trans• nova ................................................................................................................ 9  
Circuit Implementation ..................................................................................................................................... 9  
Calibration ..................................................................................................................................................... 10  
Common Mode Rejection ........................................................................................................................ 10  
Bias .......................................................................................................................................................... 10  
WARRANTY ......................................................................................................................................................... 11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
I N T R O D U C T I O N  
Th e Hafler 9303 an d 9505 are two ch an n el profession al power am plifiers. Passive coolin g with large h eatsin ks  
is used for low m ech an ical n oise. Our paten ted tran s• n ova circuit topology an d MOSFET output stage en sures  
trouble free, lon g term operation an d is backed by our seven year warran ty.  
Th is m an ual con tain s in form ation on usin g th e 9303 an d 9505 am plifiers. It is organ ized in to th ree m ain  
section s. In stallation ” covers th e location an d con n ection of th e am plifier in th e system . Like m an y precision  
com pon en ts careful atten tion to th e in itial setup can yield dividen ds in h igh er perform an ce an d trouble-free  
use. Operation ” covers th e con trols an d features of th e am plifiers an d h ow to use th em to get th e best effect.  
Th e Tech n ical In form ation ” section con tain s in form ation on th e circuit im plem en tation an d th e sch em atic  
diagram an d parts list. We stron gly urge readin g over th e In stallation an d Operation portion s of th is m an ual  
before puttin g th e am plifier in to service.  
Th e circuitry used in th e 9303 an d 9505 is th e latest refin em en t of our tran s•n ova (TRANScon ductan ce NOdal  
Voltage Am plifier, US Paten t 4,467,288) circuit. Th e 9303 an d 9505 utilize our proprietary DIABLO (paten t  
application in progress) tran scon ductan ce driver stage wh ich com bin es th e lin earity of Class A operation with  
th e curren t h eadroom of a Class B system . Wh en used in com bin ation with th e robust output stage used with  
th ese m odels, DIABLO yields lower h igh frequen cy distortion with out th e son ic pen alties associated with  
in creasin g th e n egative feedback.  
Th e 9303 an d 9505 h ave fully differen tial in puts for use in balan ced lin e system s. Th e balan ced in put term in als  
work with eith er 1/4" TRS ph on e or XLR plugs. Gold-plated RCA ph on o jacks are available for use with  
un balan ced source com pon en ts. Th e output term in als are gold-plated bin din g posts, spaced on 3/4" cen ters  
for use with dual ban an a plugs. For h igh power application s, th e am plifier can run in bridged m on o for double  
th e output voltage. Usin g state-of-th e-art surface m oun t assem bly equipm en t in our m an ufacturin g facility  
en sures con sisten cy an d reliability.  
I N S T A L L A T I O N  
LOCATION  
Th e 9303 an d 9505 can produce con siderable h eat in n orm al operation so th e prim ary con sideration wh en  
determ in in g a location for th e am plifiers is to allow for adequate ven tilation . Th e large h eatsin ks provide  
un restricted airflow, but care m ust be taken to keep th e slots in th e bottom pan el an d top cover clear, as well.  
If th e am plifier is m oun ted in an equipm en t rack, m ake sure adjacen t equipm en t does n ot im pede cool air flow  
th rough th e am plifier bottom an d out th e top. Th e attach ed feet provide sufficien t clearan ce for th e bottom  
wh en th e am plifier is restin g on a h ard surface. In adequate ven tilation can sh orten com pon en t life, especially  
wh en oth er equipm en t raises th e am bien t air tem perature, so a circulatin g fan sh ould be con sidered in tigh t  
quarters. Th e power tran sform er can gen erate a substan tial m agn etic field, so caution sh ould be exercised in  
th e placem en t of low level com pon en ts such as a tape deck, m ixer or m ic pream p to avoid in ducin g n oise in  
th e low level circuitry.  
AC LINE  
Th e 9303 an d 9505 operate from a 120 volt, 60Hz AC power lin e. Con n ection is m ade by an IEC Type 320,  
groun ded lin e cord. For safety con sideration s on ly a properly groun ded (earth ed) receptacle sh ould be used.  
If a groun ded circuit is n ot available do n ot break off th e groun d pin ; use th e proper adapter plug for a two wire  
receptacle. Located in side th e am plifier is th e lin e fuse wh ich in terrupts th e power to th e am plifier. If th is fuse  
blows replace it on ly with th e sam e type an d ratin g fuse. Th e correct replacem en t fuse value is in cluded in th e  
parts list in th e “Tech n ical In form ation ” section of th is m an ual. If th e replacem en t fuse blows, th is is an  
in dication of a fault with th e am plifier. Servicin g sh ould be perform ed on ly by a qualified tech n ician .  
1 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
INPUT  
Th e 9303 an d 9505 h ave in put jacks for both balan ced an d un balan ced in put sign als. Th e un balan ced in puts  
use con ven tion al RCA ph on o jacks. Wh en usin g th e RCA in puts, th e rear pan el BALANCED/UNBALANCED  
switch m ust be set to th e UNBALANCED position . Th e balan ced in put jacks are dual fun ction con n ectors wh ich  
accept 1/4" TRS (Rip Rin g Sleeve) ph on e or XLR plugs. Set th e BALANCED/UNBALANCED switch to th e  
BALANCED Position to use th ese jacks. Th e con n ector pin -out is prin ted on th e rear pan el of th e am p.  
Ba la n ced In put: 1/4" Tip Rin g Sleeve  
Th e 1/4" balan ced in put jack is con n ected accordin g to con ven tion al usage with th e Tip h igh (+), Rin g  
return (–) an d th e Sleeve groun d sh ield.  
Ba la n ced In put: XLR  
Th e XLR balan ced in put jack is con n ected accordin g to th e IEC In tern ation al Stan dard, with pin 2  
h igh (+), pin 3 return (–) an d pin 1 groun d sh ield. Wh en preparin g to use th e am plifier, ch eck th e  
output con figuration of th e source un it to m ain tain th e proper sign al polarity.  
Un ba la n ced In put  
Man y popular m ixers use un balan ced RCA ph on o jacks for th e m on itor outputs. For sh ort cable run s  
RCA audio patch cable can be used with out an y system perform an ce pen alty. Ch eck th e m ixer specs  
for th e m axim um cable len gth it will drive. Make sure th e BALANCED/UNBALANCED switch is set  
for UNBALANCED operation .  
Un ba la n ced Source with Ba la n ced In put  
Better n oise rejection for lon g cable run s can be ach ieved by usin g a twisted pair balan ced cable from  
th e un balan ced source. At th e source en d of th e cable, con n ect an RCA plug with th e return (–) wire  
an d sh ield con n ected to th e groun d sh ell of th e plug. Wire th e plug at th e am plifier en d of th e cable  
th e sam e as for th e regular balan ced in put con n ection .  
OUTPUT CONNECTIONS  
Th e speaker output con n ectors are dual bin din g posts. Th ese bin din g posts will directly accept 12 AWG wire  
or ban an a plugs an d are spaced on 3/4" cen ters to accept dual ban an a plugs.  
MONOPHONIC USE  
For system s with h igh power requirem en ts, th e am plifiers can be con figured for sin gle ch an n el bridged m on o  
operation . To bridge th e am plifier, set th e rear pan el STEREO/MONO switch to th e Mon o position ; use on ly  
th e left ch an n el in put, an d con n ect th e speaker to th e red output bin din g posts. Wh en th e am plifier is bridged,  
th e output is floatin g. An y speaker wh ich requires a com m on groun d from th e am plifier output can n ot be used  
in th is application . Sin ce a bridged am plifier sh ares th e load between th e two ch an n els, th e am plifier will  
effectively drive h alf of th e load. Th erefore, for bridged m on o operation we recom m en d usin g an eigh t oh m  
load as th e m in im um im pedan ce.  
2 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
O P E R A T I O N  
POWER SWITCH  
Th e POWER switch is located on th e fron t pan el of th e am plifier. An in tern al lam p in dicates wh en it is turn ed  
on . Stan dard practice is to turn th e am plifier on last an d off first wh en switch in g com pon en ts in dividually to  
preven t sen din g dam agin g tran sien ts, gen erated in th e source com pon en ts, to th e speakers. It is possible to  
leave th e power switch in th e on position an d switch th e am plifier rem otely th rough a power distribution  
block or pream p switch ed outlet. Wh en doin g so m ake sure th e switch is rated for th e curren t required by th e  
am plifier.  
BALANCED/ UNBALANCED INPUT SWITCH  
Th e BALANCED/UNBALANCED switch con figures th e in put groun din g wh en usin g th e RCA ph on o in put  
jacks. In th e UNBALANCED position th e balan ced differen tial in put return (–) port is groun ded in side th e  
am plifier. Th is preven ts n oise pickup or un stable am plifier operation caused by th e open in put. In th e  
BALANCED position th e differen tial am plifier in puts are con n ected to th e h ot (+) an d (–) in com in g sign al  
con n ectors.  
GROUND SWITCH  
Groun d loops are ch aracterized by a h um or buzz in th e system an d are caused by a voltage poten tial differen ce  
between two poin ts in a groun d circuit. Groun d loops are aggravated wh en m ultiple path s exist for a given  
circuit. Moun tin g com pon en ts in a rack with m etal rails m ay in troduce groun d loops between associated  
equipm en t, because th e rails can establish an addition al groun d path . Th e CHASSIS/FLOAT switch allows you  
to select th e am plifier groun din g sch em e for best system com patibility. With th e switch in th e CHASSIS  
position all sign al groun ds are referred to th e ch assis an d power lin e groun d. In th e FLOAT position th e sign al  
groun d is decoupled from th e ch assis. Th e position of th e switch is determ in ed by th e overall n oise in th e  
system ; ch oose th e position wh ich gives th e lowest h um .  
MONO SWITCH  
Con ven tion al two-ch an n el stereo operation is obtain ed with th e STEREO/MONO switch in th e STEREO  
position . For h igh powered sin gle ch an n el use, set th e switch to MONO an d use th e left ch an n el in put an d  
th e RED bin din g posts on ly for th e output. For th erm al con sideration s we do n ot recom m en d usin g less th an  
an eigh t oh m load on th e am plifier wh en run n in g it in m on o. Wh en th e switch is set in th e m on o position  
th e left ch an n el (+) an d (–) in puts are con n ected to th e righ t ch an n el in reversed polarity, wh ich in verts th e  
righ t ch an n el output.  
LOAD FAULT PROTECTION  
Because of th e self-protectin g properties an d fault toleran ce of th e lateral MOSFETs used in th e 9303 an d 9505,  
elaborate voltage an d curren t lim itin g protection sch em es are n ot n ecessary. To preven t dam age to th e  
am plifier from a fault in th e loudspeaker load, th e power supply B+ an d Brails are fused. Ch eck th ese fuses  
if th e soun d is garbled or th ere is n o output. Th e fuses sh ould n ot blow un der n orm al use an d a blown fuse  
is usually an in dication of a fault. Th e fault could be a bad con n ection , a problem with th e speaker or a sh ort  
in th e speaker lin e. Discon n ect power to th e am plifier before rem ovin g th e cover.  
WARM UP  
In order to ach ieve th e best son ic perform an ce from th e am plifier, we recom m en d lettin g it warm up for 1 h our  
before begin n in g an y critical listen in g. Th e am plifier will n ot deliver its full poten tial soun d quality before th is  
tim e h as passed.  
CLEANING AND MAINTENANCE  
Th ere is n o requirem en t for regular m ain ten an ce on th e electron ic com pon en ts of th e am plifier. If th e case  
becom es soiled it can be clean ed usin g a soft cloth an d a m ild detergen t, such as spray win dow or glass clean er.  
If th e am plifier is located in a particularly dusty en viron m en t clean in g th e in side with com pressed air or  
vacuum in g every 18 to 24 m on th s is sufficien t.  
3 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
S C HE MATIC DIAG R AM  
NOTES: Unless specified otherwise  
1. All resistors in ohms  
2. All capacitors in microfarads  
3. Component Designators:  
1-99:  
Left Channel  
101-199: Right Channel  
201-299: Common Parts  
301-399: Chassis/Power Supply  
4. Left Channel Only Shown  
5. Stereo/Mono Switch Shown in Stereo  
6. Balanced/Unbalanced Switch Shown in Balanced Position  
7. Chassis/Float Ground Switch Shown in Float Position  
4 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
5 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
P C BO ARD LAYO UT  
6 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
P AR TS LI S T  
DESIGNATOR VALUE  
PART #  
DESIGNATOR VALUE  
PART #  
ALL RESISTORS IN OHMS  
R213  
R214  
R215  
220, 1/4W, 5%  
220, 1/4W, 5%  
10k, 1/4W, 5%  
RM/4-221C  
RM/4-221C  
RM/4-103C  
R1, R101  
R2, R102  
R3, R103  
R4, R104  
R5, R105  
R6, R106  
R7, R107  
R8, R108  
R9, R109  
R10, R110  
R11, R111  
R12, R112  
R13, R113  
R14, R114  
R15, R115  
R16, R116  
R17, R117  
R18, R118  
R19, R119  
R20, R120  
R21, R121  
R22, R122  
R23, R123  
R24, R124  
R25, R125  
R26, R126  
R27, R127  
R28, R128  
R29, R129  
R30, R130  
R31, R131  
R32, R132  
R33, R133  
R34, R134  
R35, R135  
R36, R136  
R37, R137  
R38, R138  
R39, R139  
R40, R140  
R41, R141  
R42, R142  
R43, R143  
R44, R144  
R45, R145  
R46, R146  
R47, R147  
R48, R148  
R49, R149  
R50, R150  
R51, R151  
R52, 152  
R53, R153  
R54, R154  
R55, R155  
R56, R156  
R57, R157  
R58, R158  
R202  
47.5k, 1/4W, 1%  
47.5k, 1/4W, 1%  
1k, 1/4W, 5%  
1k, 1/4W, 5%  
2.2M, 1/4W, 5%  
100, 1/4W, 5%  
22k, 1/4W, 5%  
100, 1/4W, 5%  
100, 1/4W, 5%  
332, 1/4W, 1%  
100, 1/4W, 5%  
332, 1/4W, 1%  
22.1, 1/4W, 1%  
22.1, 1/4W, 1%  
22.1, 1/4W, 1%  
22.1, 1/4W, 1%  
1k, 1/4W, 5%  
28k, 1/4W, 1%  
909, 1/4W, 1%  
100, 1/4W, 5%  
332, 1/4W, 1%  
475, 1/4W, 1%  
332, 1/4W, 1%  
56, 1/4W, 5%  
56, 1/4W, 5%  
3.32k, 1/4W, 1%  
2k, 1/4W, 5%  
10k, 1/4W, 5%  
100, 1/4W, 5%  
1k, 1/4W, 5%  
100, 1/4W, 5%  
100, 1/4W, 5%  
2k, 1/4W, 5%  
1k, 1/4W, 5%  
1k, 1/4W, 5%  
1k, 1/4W, 5%  
100, 1/4W, 5%  
1k, 1/4W, 5%  
100, 1/4W, 5%  
28k, 1/4W, 5%  
100, 1/4W, 5%  
100, 1/4W, 5%  
1k, 1/4W, 5%  
47.5, 1/4W, 1%  
1k, 1/4W, 5%  
100, 1/4W, 5%  
100, 1/4W, 5%  
47.5, 1/4W, 1%  
475, 1/4W, 1%  
475, 1/4W, 1%  
475, 1/4W, 1%  
475, 1/4W, 1%  
56.2k, 1/4W, 1%  
220, 1/4W, 5%  
220, 1/4W, 5%  
220, 1/4W, 5%  
220, 1/4W, 5%  
0, 1/4W, 1%  
RM/4-4752C  
RM/4-4752C  
RM/4-102C  
RM/4-102C  
RM/4-225C  
RM/4-101C  
RM/4-223C  
RM/4-101C  
RM/4-101C  
RM/4-3320C  
RM/4-101C  
RM/4-3320C  
RM/4-0221C  
RM/4-0221C  
RM/4-0221C  
RM/4-0221C  
RM/4-102C  
RM/4-2802-03  
RM/4-9090C  
RM/4-101C  
RM/4-3320C  
RM/4-4750C  
RM/4-3320C  
RM/4-560C  
RM/4-560C  
RM/4-3321C  
RM/4-202C  
RM/4-103C  
RM/4-101C  
RM/4-102C  
RM/4-101C  
RM/4-101C  
RM/4-202C  
RM/4-102C  
RM/4-102C  
RM/4-102C  
RM/4-101C  
RM/4-102C  
RM/4-101C  
RM/2802-03  
RM/4-101C  
RM/4-101C  
RM/4-102C  
RM/4-0475C  
RM/4-102C  
RM/4-101C  
RM/4-101C  
RM/4-0475C  
RM/4-4750C  
RM/4-4750C  
RM/4-4750C  
RM/4-4750C  
RMP/4-5622-03  
RM/4-221C  
RM/4-221C  
RM/4-221C  
RM/4-221C  
RM/4-000C  
RM/4-3921C  
RM/4-3921C  
RM/4-223C  
RM/4-223C  
RM/4-223C  
RM/4-223C  
RM/4-6043C  
RM/4-474C  
RM/4-102C  
RM/4-102C  
P1, P101  
P2, P202  
200, Trim Pot  
200 Trim Pot  
RVH-201  
RVH-201  
D1, D101  
D2, D102  
D3, D103  
D4, D104  
D5, D105  
D6, D106  
D7, D107  
D201  
BAV99L  
BAV99L  
BAV99L  
BAV99L  
BAV99L  
BAV99L  
BAV99L  
1N5245B 15V  
BAV99L  
SS-260SM  
SS-260SM  
SS-260SM  
SS-260SM  
SS-260SM  
SS-260SM  
SS-260SM  
SS-212  
D202  
D203  
D204  
SS-260SM  
SS-212  
SS-212  
1N5245B 15V  
1N5245B 15V  
U1, U101  
U9, U109  
U201  
U202  
U203  
NPDS5566  
NPDS5566  
TL072CD  
LM337  
SS-0865  
SS-0865  
SS-143SM  
SS-240-056  
SS-240-056  
LM317  
C1, C101  
C2, C102  
C3, C103  
C4, C104  
C5, C105  
C6, C106  
C7, C107  
C8, C108  
C9, C109  
C10, C110  
C11, C111  
C12, C112  
C13, C113  
C14, C114  
C15, C115  
C16, C116  
C17, C117  
C18, C118  
C19, C119  
C20, C120  
C21  
C201, 202  
C203  
C204  
C205  
C206  
C207  
C208  
C209  
C210  
330pF, 500V  
330pF, 500V  
0.47µF, 50V  
0.1µF, 50V  
CM-331-024  
CM-331-024  
CYV-474  
CYV-104-024  
CER-107C-024  
CYV-104-024  
CER-107C-024  
CYV-104-024  
CYV-104-024  
CM-070-024  
CM-101-024  
CM-101-024  
CYV-473-024  
CM-220-024  
CM-681-024  
CM-470-024  
CPP-475MC  
CPP-475MC  
CER-209E  
100µF, 50V  
0.1µF, 50V  
100µF, 50V  
0.1µF, 50V  
0.1µF, 50V  
7pF, 500V  
100pF, 500V  
100pF, 500V  
0.047µF, 50V  
22pF, 500V  
680pF, 500V  
47pF, 500V  
4.7µF, 160V  
4.7µF, 160V  
20,000µF, 100V  
20,000µF, 100V  
0.01µF, 1000V  
0.1µF, 50V  
CER-209E  
CD-103/20-024  
CDS-104CCDB  
CER-108C-024  
CER-108C-024  
CYV-104-024  
CYV-104-024  
CER-107C-024  
CER-107C-024  
CER-106C-024  
CTR-475A-024  
CTR-475A-024  
CD-103A-024  
1000µF, 50V  
1000µF, 50V  
0.1µF, 50V  
0.1µF, 50V  
100µF, 50V  
100µF, 50V  
10µF, 50V  
4.7µF, 160V  
4.7µF, 160V  
0.01µF, 1600V  
C211  
C215  
SW1  
SW2  
SW3  
DPDT Switch  
DPDT Switch  
DPDT Switch  
SW-0280  
SW-0280  
SW-0280  
3.92k, 1/4W, 1%  
3.92k, 1/4W, 1%  
22k, 1/4W, 1%  
22k, 1/4W, 1%  
22k, 1/4W, 1%  
22k, 1/4W, 1%  
604k, 1/4W, 1%  
470k, 1/4W, 4%  
1k, 1/4W, 5%  
1k, 1/4W, 5%  
R203  
R205  
R206  
R207  
R208  
R209  
R210  
R211  
S201  
Power Switch  
Inrush Limiter  
SWH-152B  
SSH-618  
TS-201  
Q2, Q102  
Q3, Q103  
Q4, Q104  
Q5, Q105  
Q6, Q106  
Q7, Q107  
MMBT5088L  
MMBT5088L  
MMBT5088L  
MMBT5087L  
MMBT5088L  
MMBT5087L  
SS-0114  
SS-0114  
SS-0114  
SS-0115  
SS-0114  
SS-0115  
R212  
7 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
DESIGNATOR VALUE  
PART #  
SS-0115  
SS-0114  
SS-0115  
SS-0114  
SS-0115  
SS-101A  
SS-101A  
SS-102A  
SS-102A  
SSH-741T  
SSH-741T  
SSH-741T  
SSH-741T  
SSH-740T  
SSH-740T  
SSH-740T  
SSH-740T  
SS-0115  
DESIGNATOR VALUE  
PART #  
SS-222  
SSH-609  
SSH-609  
Q8, Q108  
Q10, Q110  
Q11, Q111  
Q12, Q112  
Q13, Q113  
Q14, Q114  
Q15, Q115  
Q16, Q116  
Q17, Q117  
Q45, Q145  
Q46 Q146  
Q47, Q147  
Q48, Q148  
Q49, Q149  
Q50, Q150  
Q51, Q151  
Q52, Q152  
Q201  
MMBT5087L  
BR201  
BR301  
BR-302  
Bridge Rectifier  
Bridge Rectifier  
Bridge Rectifier  
MMBT5088L  
MMBT5087L  
MMBT5088L  
MMBT5087L  
MPS-A56  
MPS-A56  
MPS-A06  
MPS-A06  
2SK1058  
2SK1058  
2SK1058  
2SK1058  
2SJ162  
2SJ162  
2SJ162  
2SJ162  
MMBT5087L  
MMBT5088L  
MMBT5088L  
IEC Connector  
IEC Line Cord  
Dual Binding Post  
MOSFET Insulator  
CC-0918  
FA-0209  
CC-0867  
HWH-442  
9303 Differences  
IEC Line Cord  
FAH-146  
C19, C119  
C20, C120  
15000µf, 75V  
15000µf, 75V  
CER-159ES  
CER-159ES  
F201  
10A, Slo/Blo  
FS-010SM  
Q202  
Q203  
SS-0114  
SS-0114  
Not Used  
2SK/1058  
2SJ/162  
Q47, Q147  
Q50, Q150  
F1, F101  
F2, F102  
F201  
AGC 10A Fuse  
AGC 10A Fuse  
15A Slo/Blo  
FS-010  
FS-010  
FS-015SB  
FS-0390  
F203, F204  
2.5A Fast Mini  
9303 / 9505 FUNCTIONAL BLOCK DIAGRAM  
SERVO  
INTEGRATOR  
(+)  
(+) BUFFER  
(+)  
LEFT INPUT  
()  
LEFT CH.  
LEFT  
AMPLIFIER  
OUTPUT  
()  
() BUFFER  
BALANCED/  
UNBALANCED  
SWITCH  
SERVO  
INTEGRATOR  
(+)  
(+) BUFFER  
(+)  
RIGHT INPUT  
()  
RIGHT CH.  
AMPLIFIER  
RIGHT  
OUTPUT  
()  
() BUFFER  
STEREO/MONO  
SWITCH  
RIGHT CH.  
LEFT CH.  
HIGH VOLTAGE  
POWER  
SOFT  
TURN ON/OFF  
SYSTEM  
HIGH VOLTAGE  
POWER  
LOW VOLTAGE  
POWER SUPPLY  
SUPPLY  
SUPPLY  
8 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TE C HNIC AL RE F E R E NC E  
THEORY AND OPERATION OF trans• nova  
The (TRANSconductance NOdal Voltage Amplifier) principle is based on our 1984 U.S. Patent 4,467,288. This patent  
describes the advantages of audio power amplifiers in which a MOSFET output stage is connected in a grounded source  
configuration. In this connection the output stage has its full voltage gain of typically 20dB (ten times), instead of the  
usual 1dB loss of voltage follower designs.  
It is an inevitable result of electrical physics that this output with gain inherently increases the power gain (for the same  
bandwidth) of the output stage by typically ten times over the conventional follower connection, using exactly the same  
MOSFET devices.  
The output stage is thus now ten times less wasteful of its incoming drive power. The driver stage can now be of a low  
voltage (±24 volts) nature and be designed along the same principles always used in high quality preamplifiers: Class  
A operation, high linearity, and wide bandwidth. A topology utilizing an output stage with gain yields a much simpler,  
shorter total signal path than that of the usual high voltage driver designs. The number of serial stages is reduced from  
five or more, to only three.  
But all of the above does not make an amplifier transnova. The output stage is further refined into a trans-impedance  
stage (current-to-voltage converter), to achieve extremely short loop (fast) negative feedback. The output stage is driven  
cooperatively by a transconductance stage (voltage-to-current converter).  
The 9303and 9505are the most sophisticated amplifiers we have yet developed utilizing the basic transnova principle.  
And, although the measured specifications are very good, the numbers do not describe the realistic sound of the  
amplifiers.  
CIRCUIT IMPLEMENTATION  
Earlier models of amplifiers we have offered using the transnova topology have earned the reputation for clean, natural  
sounding reproduction. A conservative, purist design approach was used to avoid compromising the desirable  
characteristics of the transnova circuits. Circuit innovation was not prevented by this conservatism; as is evident in the  
discoverieswhich resulted in developmentofthe DIABLO circuitryto be discussed shortly, and the novelbalanced input  
system.  
Many balancedamplifiers are merely conventional unbalanced designs with a Balanced-to-Unbalanced converter  
(usuallyICop-amp based)precedingthe poweramplifier. The 9303 and 9505, however, are true differentialinputpower  
amplifiers. Each (+) and () input port has been buffered to allow direct signal access to the differential amplifier, without  
conversion to unbalanced form. Deactivating the Balanced Mode is accomplished via a rear panel switch that grounds  
the () inputs, effectively converting the amplifier to unbalanced operation.  
The input stage is a JFET differential amplifier. This circuit configuration results in excellent front end headroom and  
extremely low intermodulation effects. The ultra low noise characteristic of the JFETs virtually eliminates noise mixing”  
(intermodulation) with the music signal, reducing discordant product frequencies known as noise grainor noise  
fuzz.A servo integrator has been employed to establish minimal DC offset. This circuit monitors the DC offset at the  
output of the amplifier, and injects an equal but opposite DC voltage into the (+) port of the differential input, thereby  
cancelling the offset. This method eliminates the need for a sonically degrading electrolytic capacitor in the audio path,  
and provides superior subsonic frequency response.  
9 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
The final output stage utilizes lateral MOSFETs; four pairs are used for each channel in the 9505 and three pairs in the  
9303. These devices, unlike conventional bipolar transistors do not exhibit thermal runaway.Thermal runaway is a  
phenomenon whereby a transistor heats up as it draws more current, which causes it to get hotter, and conduct more  
current, and so on until the device self destructs. Since the MOSFETs are inherently self protecting, no sonically  
degrading, complexcircuitryisrequired to monitorand protectthe devices. The lateralMOSFETsalso have a linearinput  
to output transfer function. Their connection in circuits and their operating characteristics are very similar to vacuum  
tubes, which is perhaps responsible for their widely recognized sonic trait of being musicaland non-fatiguing.  
Operation of the transconductance stage is a major factor in the reproduction quality of the amplifier. The number of  
MOSFETs used at the output stage of the 9303 and 9505 imposes sufficient capacitive load on the transconductance  
stage thatifa conventionalClassAstage were used (havingintrinsicallya 2:1 limiton peak-to-quiescentcurrent)itwould  
begin to show stressat the higher audio frequencies. The newly perfected DIABLO driver system (Dynamically  
Invariant A-B Linear Operation; patent application in progress) satisfies the current headroom requirement by smoothly  
and continuously varying the current transfer ratios of the two transconductance paths, under the control of the signal  
current itself. This implementation allows the current transfer ratio of one path to be smoothly and continuously reduced  
to zero while the other is smoothly and continuously increased by a factor of two. What is remarkably new here is that  
when this normally-limiting 2:1 value is reached there is now about 14dB of additional, perfectly linear current  
headroom left to drive the MOSFETs! The result is a dramatic decrease in high-frequency distortion combined with  
higher ultrasonic stability the Holy Grailof amplifier design.  
The power supply utilizes a UI style transformer with a separate primary for each channel. The transformer has a separate  
secondary for each channel high voltage power supply, each feeding a conventional split full wave bridge rectifier. High  
voltage power supply capacitance is 20,000µF per rail for each channel for the 9505 and 5,000 for the 9303. The third  
transformer secondary feeds a regulated supply for the input stage and driver circuitry. Low voltage power supply  
capacitance is 1,000µF per rail, with additional decoupling for each channel.  
CALIBRATION  
Common Mode Rejection:  
The input common mode null is adjusted by the trim pot R1 (R101 for the left channel). The CMRR should be greater  
than 75dB below rated output. If the CMRR requires adjustment, feed the amplifier input with a common mode signal  
and adjust R1. Disconnect the power to the amplifier before removing the cover. Use a sinewave generator set to 1  
volt output at 1kHz. Connect the generator signal output to the tip and ring of a 1/4" plug and ground to the sleeve. Plug  
this into the amplifier input. Connect an AC voltmeter to the amplifier output binding posts. Adjust R1 to give the lowest  
voltage output from the amplifier. For a temporary adjustment when a signal generator and voltmeter are not available,  
use an FM tuner and tune it to an unused station as your signal source, and connect the output to the amplifier as  
described above. Connect the amplifier output to a small full range speaker and adjust R1 for the lowest output from  
the speaker.  
Bias:  
The bias control establishes the quiescent Class AB output current of the amplifier. The bias should not need  
readjustment from the factory setting; however, if the amplifier is repaired and output devices have been changed, or  
if the two channels of the amplifier do not run at the same temperature, calibrating the bias is necessary. Disconnect  
the power to the amplifier before removing the cover. To adjust the bias, disconnect the input and speakers and remove  
the B+ fuse for that channel. Connect an amp meter across the now vacant fuse clips and adjust R45 (R145 for the left  
channel) to get a current reading of 300mA for the 9303, 400mA for the 9505.  
10 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
S ERVICE P O LICY AND LIMITED WARRANTY  
If you encounter any difficulty or have any question concerning your 9303 and 9505 Amplifier, please call our Technical  
Support Department weekdays, 8:00 a.m. to 3:30 p.m., Mountain Standard Time, at 800-795-2385.  
Should you have any doubts as to whether the amplifier is malfunctioning and requires service, please call us before  
sending it in for repair. All units being returned (regardless of warranty status) must receive a Return Authorization (RA)  
number. In addition, we can offer troubleshooting assistance that may simplify or even eliminate the need for factory  
service.  
The Hafler 9303 and 9505 Amplifiers are warranted to the original owner (non-transferrable) for seven years from the  
date of purchase, including parts, labor, and return shipping costs within the Continental United States, Alaska, and  
Hawaii. This warranty applies only to products sold in the United States Of America.  
For warranties outside the U.S.A., please contact your local agent.  
It is the owners responsibility to pay shipping (preferably United Parcel Service, UPS) to the factory: collect shipments  
will not be accepted. Units under warranty should be accompanied by a copy of the dated Bill Of Sale. Use the original  
carton and all packing material, with the RA number clearly marked on the outside of the package. Be sure to include  
a return address, the RA number, a daytime telephone number, and a brief description of the difficulty, including whether  
it occurs continuously or intermittently.  
This warranty gives you specific legal rights. You may also have other rights which may vary from state to state.  
11 –  
Download from Www.Somanuals.com. All Manuals Search And Download.  
HAFLER PROFESSIONAL  
A DIVISION OF  
ROCKFORD CORPROATION  
546 SOUTH ROCKFORD DRIVE  
TEMPE, ARIZONA 85281 U.S.A.  
IN U.S.A. (602) 967-3565  
IN EUROPE, FAX (49) 4207-801250  
IN JAPAN, FAX (81) 559-79-01265  
MAN-0587-D  
4/95  
Download from Www.Somanuals.com. All Manuals Search And Download.  

Graco Baby Swing DM17CS User Manual
Hamilton Beach Waffle Iron 26040 User Manual
Hans Grohe Plumbing Product 06593000 User Manual
Harbor Freight Tools Paint Sprayer 43760 User Manual
Hasbro Games 56675 User Manual
Honeywell All in One Printer 1250gAP User Manual
Hubbell Work Light UE24 User Manual
Hunter Fan Outdoor Ceiling Fan 28528 User Manual
Husqvarna Snow Blower 521SSE User Manual
IBM Time Clock OS 390 User Manual