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THE

PREAMPLIFIER

DH-110

INSTRUCTIONS

for ASSEMBLY

and OPERATION

LM132

$3.00

Please refer to this serial

number in all communications

regarding this equipment.

THE DAVID HAFLER COMPANY

5910 Crescent Boulevard, Pennsauken, New Jersey 08109

Содержание DH-110

Страница 1: ... DH 110 INSTRUCTIONS for ASSEMBLY and OPERATION LM132 3 00 Please refer to this serial number in all communications regarding this equipment THE DAVID HAFLER COMPANY 5910 Crescent Boulevard Pennsauken New Jersey 08109 ...

Страница 2: ...s maximum Phono in Line out 10 Vp p 1 kHz square wave load is 10 000 ohms in parallel with 10 nF Crosstalk 3 14 down 72 dB any input to any output Separation 4 2 greater than 82 dB 1 kHz greater than 52 dB 20 kHz Gain Tracking Error 4 4 less than 0 5 dB Maximum Output Noise less than 350 microvolts wideband less than 95 microvolts A weighted with 1 Kohm input termination volume full CW Bass Contro...

Страница 3: ... tolerance components and RIAA phono equalization is engineered to very narrow limits maintain ing accurate phase relationships and correct spatial perspectives as well as exceptional unit to unit consis tency The tone controls which can provide contouring of response for individual needs when switched in are nor mally isolated from the circuit for ruler flat response The components in the DH 110 ...

Страница 4: ...be obtained by following that recommenda tion If you have chosen the DH 110 for its sonic attributes you will be more likely than most to be aware of these dif ferences and will want proper cartridge termination The Additional Information section of this manual de tails the determination of the loading capacitor for a specified cartridge load It also describes how the resistive load of the phono i...

Страница 5: ...t most LED indicating that the Selector switch is determining the signal source At turn off it is normal for the LED to fade slowly as the operating voltages decline DELAYED TURN ON An internal muting circuit prevents the voltage tran sients which may occur at turn on or turn off from causing annoying noises blown fuses or damaged loudspeakers At turn on the Line Outputs but not the Recording Outp...

Страница 6: ... channels will be matched to 0 1 dB Only the Left signal will be heard with the control fully counterclockwise and only the Right signal at the other extreme The ideal situation would find symmetry in room acous tics and in the electronics but this realization is rare Stereo reproduction is at best a splendid illusion and the function of the Balance control is to optimize this illusion in the list...

Страница 7: ...nections are more likely Pencil irons are much lighter and easier to use and there is no waiting time when solder connections follow in sequence as in kit building Make sure you have a holder for it though and always unplug it when you take a break Proper Soldering There are four steps to make a good solder connection 1 Make a good mechanical connection to hold the wire in position while heat and ...

Страница 8: ... Allow the excess to flow away onto the iron When properly done the wire is uniformly bright and no larger than before The hookup wire supplied with this kit does not normally need tinning for it is pre tinned Wiring the Kit If any components are unfamiliar to you checking the pictorial diagram should quickly identify them Or the quantities and the process of elimination as you check the parts lis...

Страница 9: ...end of the green wire through lug 3 of the phone jack and connect it to lug 4 Solder both lugs Connect the red wire to lug 2 S 6 0 Select the power switch and two 4 screws Install the switch above the headphone jack so that the body of the switch is offset to the outer edge of the panel 7 0 Select the main PC 14 circuit board assembly with the fuse in place and the rear bracket installed and a rub...

Страница 10: ...circuit side of the board into one of the mounting holes next to the rear jumpers Add a spacer on the components side and tighten it Set the completed board assembly aside 19 0 Select the back panel the AC line cord and the plas tic strain relief Separate the two conductors at the end of the cord for 2 Cut 3 4 off of one conductor Strip both ends the usual and tin the strands to secure them Six in...

Страница 11: ... rear bracket ate outside the side pieces Select 2 sheet metal screws and fas ten the bracket tabs to the side pieces 34 0 Plug the two flat wire assemblies onto the pin con nectors on PC 14 35 IJ Prepare a 1 piece of white wire Connect one end to the rear lug of the power switch S Connect the other end to eyelet Y of PC 14 nearest the fuse S All eyelet connections should be soldered on the bottom...

Страница 12: ... 0 RIGHT n n IGHT PHONO LEFT PHON i 1 6 IN 02 13 03 15 1 15T1 I 1I I ot60 04 SELECTOR MONITOR TONE r I I _EPL I 1 1 PHONO M SlA R t K s 3 FLAT ROUND D13 D14 ...

Страница 13: ...FT LINE r 0107 J Q xo T c21 012 oE Cl9 I 1 I 1 Ql R44 izJ 141 R144 011 0 D5k 0 Fl v I E 1 co 0 0 527 0 Do EO M l D6 D7k 0 c34 0 C36 0 C32 v R66 R56 llll h R65 8 6 g 3 Ic38 R62 K TUK 8 III1 I R57 0 6 R45 iD12 VOLUME R59 R64 L R R26 ...

Страница 14: ...e around each knob It is possible to shift the phone jack bracket slightly or the mounting of an individual control by resolder ing if necessary for correct alignment Slip each end cap into the slots of the front panel Select the 4 cap screws and nuts and secure the end caps with the large Allen wrench 53 0 Install the appropriate loading capacitors at the pairs of holes identified E F G and H bel...

Страница 15: ...k for a defective connecting cable or turn table ground wire Inside the preamp the screws for the thumb nut ground connections must be tight both to the PC 12 board where the lockwasher under the screw head contacts the circuit ground and to the back panel where the lockwasher must break through the paint to the metal Also the PC 14 rear bracket mounting screw near the power transformer must be ti...

Страница 16: ...le accepts plug in cables you can usually overlook its internal wiring capacitance as it will likely be within the 50pF tolerance Short cables are desirable because total cable capacitance can itself be higher than the total specified load The lowest you can go in compen sation is to leave that capacitor out It is why a good preamp design has a low input capacitance As an example Recommended cartr...

Страница 17: ...d then turn the preamp ON Use connecting cables of high quality and treat them with care Unplug cables by grasping the connector not the cord to maintain good connections We have no evi dence that special connector platings are required but the surfaces should be free from grease fingerprints or any contaminate that may prevent a firm and complete connec tion Some audiophiles are convinced that a ...

Страница 18: ... w 1 CD Video Phono 1 Phono 2 Tuner Record Out EPL Send EPL Roturn PHONO 1 C 2 B C R TONE FILTER EPL Treble Bass SAL VOL v v 0 0 1 LINE OUTPUTI To Right Channel r K Switched E Direct FUNCTIONAL BLOCK DIAGRAM 1 8 ...

Страница 19: ...4 RM035 RCO29 RC023 RC029 RC023 RC042 RCO44 RCO44 RC038 RC0l6 RC028 RC046 RC029 RC017 RC043 RC0l6 RC023 RC015 RC0l5 RM034 SPI I2 SRl I2 SR111 SPI I3 SAI I6 SP111 SA1 16 SLll2 C l 5 ET0 Cl1 Cl2 Cl3 Cl4 Cl5 Cl6 Cl7 Cl8 Cl9 C20 c21 c22 C23 C24 C25 C26 C27 C28 C29 C30 C3l C32 c33 C34 c35 CM c37 C38 c39 C40 C4l Dl D2 D3 D4 D5 D6 D7 D8 D9 D10 Dll D12 D13 D14 ICl IC2 IC3 Fl 10 mF polypropykne 5Ov CP111 1...

Страница 20: ...L I 1 L 7 l0g000 QQJ 527 R a rbd 1 I3 L I4 I pm I 0 8 _ 7 513 b 6 R 1 black SWITCH PINS SEEN FROM BOTTOM OF CIRCUIT CARD NOTE Tranaformu shown wind for 12OVolt primary For other vo1tag a 8 chart at right P ER ACCESSORY OUTLETS U Cl8 00 07 b s2c S2d s3a 50 08 4 0 00 1 2 3 4 5 6 1 6 2 3 4 5 t 2 3 4 1 2 3 4 3 0 010 OOOOOOOOQOOO 10000 0 0 0 0 1 I I POWER SUPPLY 2 0 e s2a S2b S3b s3c 10 012 ...

Страница 21: ...PLIFIER SCHEMATIC DIAGRAM 8 85 LEFT CHANNEL SHOWN TO QlS S7 C30 AND RSO LARGE CIRCUIT CARD IS PC14c CABLE PIN ASSIGNMENTS J22 TO J23 A PIN 1 AUX L 2 TUNER L 3 RECORD L 4 LINE GND L 5 SHIELD GND 6 AUX R 7 RECORD R 8 TUNER R S LINE GND R 10 PHDN02R 11 WON0 GNDR 12 PHDND2L 13 PHOND 1 R 14 PHOND GND L 15PHONOlL J24 T O J25 B PIN 1 GUT LINE L 2 SHIELD 3 WT LINE R 4 SHIELD 5 EPLSENDR 6 EPL RETURN R 7 SH...

Страница 22: ...s RM025 brown brown black brown Resistor 22 IK ohms RM035 ted red brown red Resistor 1 megohm RM044 brown black black yellow Set screw 8 x 3 16 Socket 4 pin bottom entry Washer volume control M8 flat LED red Shrink tubing 1 HP122 XM012 HWlll QD119 HR135 Nut 4 40 KEP Nut 6 32 KEP Nut 10 32 KEP Nut control shaft M7 x 75 Nut 3 8 Lockwasher 3 8 Screw 4 40 x 5116 Screw 4 40 x 5 8 black screw 4 40 x 7 8...

Страница 23: ...r some purpose for which it was not designed or in tended Technical assistance to help you locate the source of a problem may be obtained by calling the Hafler Company Technical Service Department at 609 662 6084 between 8 am and 4 30 pm eastern time It will be helpful to know the serial number and the results of any tests you have per formed However we do not recommend that you attempt your own s...

Страница 24: ...Printed in USA ...

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