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THE
PREAMPLIFIER
DH-110
INSTRUCTIONS
for ASSEMBLY
and OPERATION
LM132
Please refer to this serial
number in all communications
$3.00
regarding this equipment.
THE DAVID HAFLER COMPANY
5910 Crescent Boulevard, Pennsauken, New Jersey 08109
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SPECIFICATIONS The numbers in parentheses refer to the paragraph in the IHF specifications manual which defines the test procedure. PHONO PREAMP SECTION Rated Output: 3 Wms, 8 Hz-105 kHz Maximum Output (3.5): 12 Vrms, 20 Hz-20 kHz at recording output Total Harmonic Distortion: Less than 0.0006% @ 1 kHz, 3 Vrms Frequency Response (3.13): +0, -0.25 dB, 20 Hz-20 kHz RIAA Equalization Accuracy: +0, -0.1 dB, 30 Hz-15 kHz Full Power Bandwidth: -6 dB, 4 Hz-210 kHz Sensitivity (3.7): 12.5 millivolts Max
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INTRODUCTION Precise interchannel balance at all frequencies is main- Your preamplifier is the control center of your music system, acting as an interface between the sound tained with close tolerance components, and RIAA phono equalization is engineered to very narrow limits, maintain- sources-record players, tape recorders, FM and Video tuners-and the power amplifier which drives the ing accurate phase relationships and correct spatial perspectives, as well as exceptional unit-to-unit consis-
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The Additional Information section of this manual de- The DH-110 is provided with accessory Rack Mount end caps in addition to the standard end caps installed on the tails the determination of the loading capacitor for a unit. These accessory caps extend the width of the front specified cartridge load. It also describes how the resistive panel to that of a standard 19” rack, with appropriate load of the phono inputs may be changed, if needed, from the standard 47K ohms. mounting holes. Installat
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fects that can result from unpowered electronic circuits in which is otherwise a possibility. We recommend that you the tape decks when they are connected to the Recording turn off power amplifiers before connecting headphones, Outputs, it is recommended that tape recorders be or that they be plugged in before the system is switched on, switched on when the preamplifier is in use. This is a as a precaution. commonly overlooked cause of less-than-ideal The Direct outputs provide conventional sign
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The following controls affect all signals which are will be heard with the control fully counterclockwise, and only the Right signal at the other extreme. heard through speakers or headphones. They have no effect on the signals to the recording outputs. The ideal situation would find symmetry in room acous- tics and in the electronics, but this realization is rare. MONO SWITCH Stereo reproduction is, at best, a splendid illusion, and the When this button is IN, left and right channel informa- fu
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because he may not wait long enough for it to reach operat- There are three basic rules for success in electronic kit ing temperature each time it is switched on, poor solder building: connections are more likely. Pencil irons are much lighter 1: Read the instructions carefully, and follow them in or- and easier to use, and there is no waiting time when solder der. connections follow in sequence, as in kit building. Make 2. Make secure solder connections which are bright and sure you have a hold
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Wiring the Kit Excess solder may be removed from a connection by heat- ing it and allowing the solder to flow onto the iron, which is If any components are unfamiliar to you, checking the then wiped on the sponge. pictorial diagram should quickly identify them. Or, the quantities, and the process of elimination as you check the ALL SOLDER USED MUST BE ROSIN CORE parts list, will help. The pictorial diagram is necessarily distorted to some extent for clarity, so that you can trace Never use acid
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BUILDING THE KIT 6 0 Select the power switch and two #4 screws. Install Partial mechanical assembly of the kit provides protec- the switch above the headphone jack so that the tion for major components during shipment. Most of the body of the switch is offset to the outer edge of the hardware thus used is included in the quantities listed in panel. the parts list. The exception is that used to install the rear mounting bracket on the PC-14, as this is considered an in- 7 0 Select the main PC-14
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each socket, the board is marked to indicate the side of Then grip the larger portion of the strain relief with the hole on which the center mounting tab should be the tips of the pliers, squeeze it tightly, and insert the positioned, so that it will be soldered to the widest part of end of the cord and the strain relief through the panel the circuitry on the back side. Leave the phono plug in the hole from the outside. Note that the hole has a flat on socket while bending and soldering is compl
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23 [7 Select the 6 black 5/8" screws, the 6 spacers, and 6 34 0 Plug the two flat wire assemblies onto the pin con- small nuts. Insert the screws from the outside of the nectors on PC-14. back panel at the locations nearer the center of the panel (not in the end holes marked “Grounds”). 35 IJ Prepare a 1%” piece of white wire. Connect one end Install a spacer on each screw and tighten them. to the rear lug of the power switch. (S). Connect the Place the PC-12 assembly in position so that its two
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@ IGHT PHONO LEFT PHON’ 0 RIGHT nn I’ i 1.6 02 13 IN 03 15-1 15T1 , 1 I I! ot60” 04 SELECTOR MONITOR _EPL TONE r- I I 1 1 PHONO M I SlA R t+ K s3 FLAT ROUND D13 D14
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HT LINE- - LEFT LINE - co “0 “0 aa Fl “;T v 527 0 (0 Do I No 0109 E EO 1 n E 0 -D5k -r 0107 T c21 - 012 (J Q-&xo 011 -Ml- @oE 0 +D6- -D7k C32 c34 C36 0 0 0 Cl9 v --R56- --R66- llll h -R65- 8 6 g 3 Ic38) K(TUK 8 -R62- --R57- III1 I ‘0 “6 I 1 I 1 ,- iD12- VOLUME --R59- - -R64- L --R45- -R44- Ql- R izJ 141- --R144- R26
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wire to hole Q, which is between the center lugs of cap into the slots of the front panel. Select the 4 cap Jll and 512. (S). The wire should not protrude sig- screws and nuts, and secure the end caps with the nificantly beyond the front surface of the board to large Allen wrench. avoid coming in contact with a connector. To assure 53 0 Install the appropriate loading capacitors at the pairs a good solder connection, bare wire should be visi- ble on the circuit side of the board. Connect the of
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IF A PROBLEM ARISES If neither LED lights when you first turn on the power If there is noticeable hum; turn off the unit and reverse switch, turn the unit off immediately. Check the fuse. the line cord. Make sure the preamp is not too close to the power amplifier (or that the turntable is not too close, Check the polarity of the LEDs. Check the power transformer wiring for proper connections for your line either). Check for a defective connecting cable, or turn- table ground wire. Inside the pre
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ADDITIONAL INFORMATION RACK MOUNT END CAP INSTALLATION If you require new capacitors, we suggest that you Every DH-110 is supplied with front panel accessory end purchase, if possible, either polypropylene or polystyrene caps which adapt it to a standard 19” rack panel, and with a types. These premium grades have been selected for all 5/32” Allen wrench which fits the mounting screws. critical circuits in the DH-110 because of their superior audio performance. Their leads should be formed like R
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Use connecting cables of high quality, and treat them MINIMIZING NOISE IN THE SYSTEM with care. Unplug cables by grasping the connector-not the cord-to maintain good connections. We have no evi- Your choice of separate components is the right way to dence that special connector platings are required, but the secure the best performance from a music system, but the surfaces should be free from grease, fingerprints, or any wide-band characteristics and complexity of the best sys- contaminate that
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Tape 2 TONE law 1 FILTER CD/Video Treble Bass EPL PHONO SAL VOL Phono 1 1 v v, C 0 0 2 Phono 2 R C B Tuner LINE OUTPUTI To Right Record Out Channel EPL Send r-K 1 EPL Roturn Switched E Direct FUNCTIONAL BLOCK DIAGRAM 18
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COMPONENT VALUES Rii channel corresponding values have designations above 100. All resistors are 1/4 watt I% Metal Film unless otherwise noted. Cl 10 m F, polypropykne, 5Ov CP111 93,lOOohms RM045 RI 120 pF, polypropylene, 50v CPll2 R2 93,1OO ohms RMO45 :: 220 pF, polypropykne. 50v CPl16 R3 1,100 ohms RM025 CP11 22,100 ohms RM035 10nF polypropylene, 5Ov R4 :: 22 mfd, NP ekctmlytic, 5Ov CNll6 R.5 22,100 ohms RM035 220 mfd, NP ekctmlytic, IOv CNll2 R6 147.000 ohms RMO43 :5 220 mfd, NP ekctrolytic,
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CABLE PIN NUMBERS PC12a ISELECTOR] TUNER @j----o N ” TAPE 1 R24 ,T I I I I EPL SEND (0)“’ ‘I I e m-c JlO I DIRECT OUTPUT -U+ OUTPUT VIA PHONE JACK PHONO 1 PHONO 2 I L GROUND pos1.s Twisted 7 1 L Wlms 6 l0g000 QQJ 527 ,a rbd 1 R I3 L pm*” I4 I Cl8 I - PHONE 0 8 _ JACK 513 b 6 7 ‘R 1 black 00 07 b . s2c S2d s3a 50 08 t 234 1234 40 00 123456162345 10000 00001 I I POWER SUPPLY 30 010 ~OOOOOOOOQOOO] 20 e,, S3b s3c s2a S2b 10 012 SWITCH PINS SEEN FROM BOTTOM OF CIRCUIT CARD NOTE: Tranaformu shown wind
