Table of Contents
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Summary of Contents for Hafler DH-110
- Page 1 PREAMPLIFIER and OPERATION THE DAVID HAFLER COMPANY 5910 Crescent Boulevard, Pennsauken, New Jersey 08109 INSTRUCTIONS for ASSEMBLY LM132 Please $3.00 number in all communications regarding this equipment. DH-110 DH-110 refer to this serial...
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Page 2: General 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... -
Page 3: Table Of Contents
Exceedingly low noise and distortion is a hallmark of the DH-110. Noise is essentially inaudible in the absence of a signal, and distortion of all types, both steady state and transient, is at or below the threshold of the finest mea- surement capabilities. -
Page 4: Power Connections
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. -
Page 5: Operation
And a power amplifier which is turned off can- not degrade the quality of signal to the headphones- When you turn on the DH-110, power is also applied to the switched AC outlets on the back panel. One of the red LEDs on the front panel will light, indicating that the preamp is functioning. - Page 6 Since the switch permits bypassing the processor loop, an unpowered de- vice in the EPL circuit will not deteriorate the DH-110 per- formance, as might be the case with switched-off tape decks in the Record Outputs. The EPL switch can also function as an additional input selection.
- Page 7 2. Make secure solder connections which are bright and smooth. 3. Check your work carefully after each step. The DH-110 preamplifier is a versatile component with sophisticated circuitry which has been made remarkably easy to build by individuals with many years of experience in the design and engineering of the finest performing audio kits, and in the preparation of their manuals.
- Page 8 Excess solder may be removed from a connection by heat- ing it and allowing the solder to flow onto the iron, which is then wiped on the sponge. ALL SOLDER USED MUST BE ROSIN CORE Never use acid core solder or any separate flux in elec- tronic work.
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Page 9: Building The Kit
Partial mechanical assembly of the kit provides protec- tion for major components during shipment. Most of the hardware thus used is included in the quantities listed in the parts list. The exception is that used to install the rear mounting bracket on the PC-14, as this is considered an in- tegral assembly. - Page 10 each socket, the board is marked to indicate the side of the hole on which the center mounting tab should be positioned, so that it will be soldered to the widest part of the circuitry on the back side. Leave the phono plug in the socket while bending and soldering is completed.
- Page 11 23 [7 Select the 6 black 5/8" screws, the 6 spacers, and 6 small nuts. Insert the screws from the outside of the back panel at the locations nearer the center of the panel (not in the end holes marked “Grounds”). Install a spacer on each screw and tighten them.
- Page 12 IGHT PHONO i 1.6 13 03 , IN 15-1 SELECTOR ot60” PHONO M LEFT PHON’ MONITOR _EPL FLAT R O U N D RIGHT 15T1 TONE I ’...
- Page 13 LINE- - LEFT LINE - “;T No 0109 -r 0107 Q-&xo --R45- -R44- 141- --R144- -D5k - M l - +D6- -D7k --R66- llll -R65- -R62- K(TUK III1 iD12- --R59- -R64- co “0 “0 C 3 6 --R56- Ic38) --R57- VOLUME ‘0 “6...
- Page 14 wire to hole Q, which is between the center lugs of Jll and 512. (S). The wire should not protrude sig- nificantly beyond the front surface of the board to avoid coming in contact with a connector. To assure a good solder connection, bare wire should be visi- ble on the circuit side of the board.
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Page 15: If A Problem Arises
Check the PC-12 for a solder splash between the circuit paths. A sharp knife can correct that. The power transformer supplied with the DH-110 has dual tapped primary windings. By arranging these two windings in various series-parallel combinations, line vol- tages of 100,120,200,220 and 240 volt 50/60 Hz lines can be accommodated. -
Page 16: Additional Information
‘load’ or termination for the car- tridge. The needed capacitance is expressed in picofarads (pF). The DH-110 is supplied with pairs of two values of capacitors plugged into the sockets behind the rear circuit board at the Phono inputs (one for each channel). One of... -
Page 17: Minimizing Noise In The System
Careful interwiring practice will greatly reduce the likelihood of such problems. The DH-110 is a very quiet preformer. There can be oc- casions where even the finest equipment exhibits hum or noise due to irregularities in its interconnection. The sim- ple expedient of reversing line cord plugs will often reduce hum. -
Page 18: Functional Block Diagram
Tape 2 l a w 1 CD/Video PHONO Phono 1 Phono 2 Tuner Record Out EPL Send EPL Roturn FUNCTIONAL BLOCK DIAGRAM TONE FILTER Treble Bass SAL V O L LINE OUTPUTI To Right Channel Switched E Direct... -
Page 19: Component Values
All resistors are 1/4 watt I% Metal Film unless otherwise noted. 93,lOOohms 93,1OO ohms 1,100 ohms 22,100 ohms R. 5 22,100 ohms 147.000 ohms 147,000 ohms 22,100 ohms 22,100 ohms 4 7 , 5 0 0 o h m s 4 7 , 5 0 0 o h m s 100 ohms, 1/ 2 w, 5% carbon film 100 ohms, 1/2 w, 5% carbon film... -
Page 20: Power Supply
CABLE PIN NUMBERS PC12a TUNER @j----o TAPE 1 E P L S E N D (0)“’ DIRECT O U T P U T OUTPUT PHONE JACK PHONO 1 PHONO 2 G R O U N D pos1.s pm*” P H O N E JACK ‘R black... -
Page 21: Line Amplifier
PC13 IB*LINCE] lYONOl Fcml R l75y7q SYMBOLS P O W E R S U P P L Y G R O U N D SHIELD GROUND m L E F T , > CHANNEL SIGNAL GROUND m R I G H T 1 POWER SUPPLY RAILS... -
Page 22: Kit Parts List
KIT PARTS LIST KIT PARTS LIST Minor variations may sometimes be encountered in value or appearance. These will not affect performance. Some items may have been used to package the kit for shipment. Cover, black Bottom plate Front Panel extrusion, black Front subpanel Back panel, black Side piece... -
Page 23: Service Policy And Limited Warranty
WARRANTY FOR KIT-BUILT The parts in a DH-110 kit are warranted for a full year If you cannot locate the cause of a problem in your DH- This warranty is void if the kit has not been completely This warranty gives you certain rights. - Page 24 Printed in USA...
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