Eico HF-81 User Manual Download Page 1 | Manualshive

Page: 1 / 47

background image

1
2
3
...
»

Summary of Contents for HF-81

Page 1: ......

Page 2: ...S tape head equalization for either 7 1 2 15 or 3 3 4ips tape speeds 2 Separate high level inputs for AM FM and FM Multiplex Also two auxiliary A inputs one in each channel and two auxil iary B inputs one in each channel Input Selector switch on front panel has positions for feed ing FM tuner output to one channel and AM tuner to other or FM tuner to one channel and FM Multiplex adapter output to ...

Page 3: ...r above 8 20 cps 15 kc Sensitivity input for rated output mag phono 4mv tape head 7 5 ips 2 mv tape head 3 75 ips 5mv mic 6mv tuners auxiliaries 0 5V Hum Noise Level below rated output mag phono 60db tape head 51 db mic 57 db tuners aux iI iaries 75 db Tone Control Range I 15db at 50c and 10kc Speaker Connections 4 8 and 16 ohms Tubes 4 ECC83 12AX7 2 ECC82 12AU7 4 EL84 2 EZ81 Size 15 wide 4 3 4 hi...

Page 4: ...ation is about one foat CONSOLE MOUNTING a 0 erationsonconsolefront anel reliminar to am li fier mounting Tape the panel template provided to the face of the console so that the top of the mounting sur face line on the template is level with the top of the amplifier mounting shelf Note When shelf is not avail able tape the template atanyconvenientspot on the face of the console 2 Use an awl or a n...

Page 5: ...hassis must be set to SEP arate Signal connections are all internal so only the speaker connection need to shown Fig la rear chassis view The internal arrangement ion in the HF 81 at each of the positions of the FUNCTION selector are shown in Figs Ib lc Id Ie If and 19 as an aid to understand ing the operation with this arrangement SPKR SPKR FIG la SPEAKER CONNECTIONS FIG CHECK AMPL 1 CH I LOW LEV...

Page 6: ...lleled at the outputs as shown by an external jumper connected between corresponding speaker connection taps The external signal connection and the speaker connections are shown in Fig 2a The internal arrangements in the HF 81 at each of the positions of the FUNCTION selector are shown in Figs 2b 2c 2d 2e and 2g as an aid to understanding the operation with this arrangement CH 1 LOW LEVEL INPUTS F...

Page 7: ...OW LEVEL INPUTS CH I LOW LEVEL INPUTS CH 2 LOW LEVEL INPUTS CH I LOW LEVEL INPUTS CH 2 HIGH LEVEL INPUTS CH TAPE OUT CH I HIGH LEVEL INPUTS CH TAPE OUT CH 2 HIGH LEVEL INPUTS CH TAPE OUT CH 2 HIGH LEVEL INPUTS CH TAPE OUT CH I HIGH LEVEL INPUTS CH TAPE OUT SPEAKER CH SPEAKER CH SPEAKER CH SPEAKER CH SPEAKER CH SPEAKER CH SPEAKER CH ...

Page 8: ... x RI ohms 00 RI or th is tabl e for RI 50KQ use Rs 1 OOKQ for RI 33KQ use Rs 50KQ for RI 25KQ use Rs 33KQ SPEAKER CH NOTE All ceramic cartridge manufacturers have devel oped simple networks which when connected the outputs of their cartridges result in a characteristic identical to that of magnetic cartridges By interposing the recom mended adaptor for the particular ceramic cartridge be tween th...

Page 9: ...tput such as a cathode follower with which up to 50ft of cable can be used use the shortest possible connection and low capacity shielded cable cable having as low as 25mmfd capacitance per foot is available d TAPE OUTPUT 1 TAPE OUTPUT 2 When no external amplifier is used in the system both these outputs are available for feeding out to a stereo recorder When an external power ampl ifier is used i...

Page 10: ...udio system including room acoustics Set the FUNCTION SELECTOR to STEREO NORMAL or STEREO REVERSE for stereophonic records and to MONOPHONIC PHON 0 for CONVENTIONAL MON OPHON IC records LISTENING TO TAPE DECK direct connection to tape head Set the INPUT SELECTOR to TAPE NARTB tape head equalization is provided in both channels for the tape speed selected with the TAPE switch on the front nel One p...

Page 11: ...ase direct hum pick up by the magnetic cartridge from the record player motor tryusing a rubber mat on the turntable to increase the separation of the pick up from the motor or pick up from a power transformer or other magnetic field in the vicinity try moving phonograph away from suspected source Check also that the phono input cable shielding is grounded to the ampl fier chassis at one point onl...

Page 12: ...ons seems to give bass re inforcement and the other bass cancellation The connection that gives bass re inforcement is the in phase connection and should be used Another criterion for the in phase connection is that of blending which can be best applied if the speaker systems are identical or at least have similar middle and high frequency range reproducers With the in phase con nection and both s...

Page 13: ...ally or externally Connection from C39 to pin 3 of VII V12 broken Connection to center tap of h v second ary winding of T1 open Output tubes V7 VS V9 VI0 over biased or not drawing current May re sult from open R56 or R57 Excessive current drain in amplifier Defective VII V12 VI or V2 defective FiI leads dressed toa close to grid lead Tube shield not making electrical con tact to base or base not ...

Page 14: ...VAC to pin 9 500 290KO 90KO 2KO fi lament 500 ECC82 12AU7 1 2 120KO V3 V4 61OKO 1 3KO 4 5 filament OVDC 6 3VAC to pin 9 500 170KO 190KO 1 8 1 75 065 8KO filament 500 ECC83 12AX7 195 190 100KO V5 V6 470KO 100KO 4 5 filament OVDC 6 3VAC to pin 9 500 470KO 1 15 250KO 1 1 7KO filament 500 EL84 6BQ5 340KO 1 340KO 12 14 1650 4 5 filament OVDC 6 3V AC between pins 4 5 500 330KO 335 325 180 165 1900 330KO...

Page 15: ...ents are measured to chassis with the controls set as follows INPUT SELECTOR to PHONO FUNCTION SELECTOR to STERO NORMAL LEVEL at 10 BASS TREBLE FOCUS controls at O For voltage measurements at 14W output set the input selector to the PHONO position and feed a O 0035volt 3 5mv 1 kc signal to the CH 1 CH 2 Mag Phono Input jacks connect a resistive preferably non inductive load to the output of each a...

Page 16: ...e maximum counter_clockwise position AUXA and CH 1CHECK as seen from the front or shaft end TOP VIEW t ECC83 12AX7 L 6BQ5 84 6BQ5 84 6BQ5 L 4 6BQ5 OPERATES FROM V SO 6C CYCLE AC LINE MODEL HF POWER CONSUMPT ON DUAL 14 WATT HIGH FIDELITY 140 WATTS INTEGRATED AMPL ER r V r ECC83 12AX7V ECC82 12AU7V r r V ECC83 12AX7 V VECC83 12AX7 r V 11 r V r V VEZ81 JEZ81 VECC82 12AU7 ELECTRONIC INST CO INC noo NO...

Page 17: ...ck yellow gold 43004 lug 18 ground 46 46000 grommet 3 8 10422 R19 20 60 res 68KQ 1 NI 10 blue grey orange silver 46006 feet rubber 11518 R2I res 2 2MQ l NI 5 red red green gold 50012 insulator for 50011 _18045 R22 23 pot 750KQ linear dual 50019 insulator for 50018 8046 R24 25 pot 250KQ audio dual 50021 insulator for 50020 10435 R26 res 150KQ 1 10 brown green yellow silver 51006 pbono plug 10414 R2...

Page 18: ... 2N 10 res IMQ I 2N 10 res JMQ I 2N 10 res 200KQ I 2N 5 res 200KD I 2N 5 res 7KD I 2N JO R71 4 5 JI4 R59 C31 JI5 R58 C18 C32 R32 R42 IV R60 R61 R62 R63 RJ4 RJ5 R16 R17 RJ8 R19 R20 R2l oR22 R23 R24 rt25 R26 R27 R28 R29 R30 R31 R32 R33 R34 R35 R36 R37 R38 Descri tion Description 5ym Description res 4 7KD I 2N 10 R39 res 470KD I 2W 10 R64 pat 1O0Q res 9OKD I 2N 5 R uJ res lOKn J 2W 10 R65 res 330KQ I...

Page 19: ......

Page 20: ......

Page 21: ... jO AUOW AJaA tDljt atou asoald NOll V I lIlN301 Sl V d O puo OOL Allonsn S S JHAloJpala JOj a JuoJalot aljt puo JatoaJ6 AlloHUOtS Ins aJO SJOH Jodo J Jadod uo sa JuoJal01 lZ puo lZ V uaaM Jaq aJaljM AUO aJnsoaw AOW Jots saJ OL F I lL aljt aldwoxa Jo l a JuoJalot t n JJ J alqoMollo aljt U ljHM AJOA II M tuauodwo J 0 jO anloA aljt toljt pu j II M noA sa JuOtswn JJp AUO Japun xnH atsod JO P Jo asn W...

Page 22: ...TB20 to TB21 XV12 XVll TBll 8 Fig 1 TB19 XV10 XV9 TB 14 TB18 TB5 TB13 TB17 TB4 TB1 TB2 XV8 Jl11213 J8910 TB3 XV6 ...

Page 23: ...ting procedure in order to settle such matters as orientation of terminal boards keyways on tube sockets etc The wiring which comes later will be greatly facilitated if after mounting each part the symbol number of the part is written on the bottom of the chassis next to the part with a crayon soft pencil v Fig 1 Mount the 9 pin miniature tube socket XV12 as shown Use two 4 40 screws two 4 lockwas...

Page 24: ...gold 5 resistors R15 and R16 to 1 2 Connect R15 from SlB 3 C to SlB l C Conne R16 from SlG 2 C to SlG 4 C 3 d Fig 2 Cut all leads on two 850mmf disc capacitors C9 and C10 to 3 4 Connect C9 fromS1B 3 S2 to SlB l C Connect CI0 fromS 1 G 2 C to S 1 4 S2 4 J Fig 2 Cut all leads on two 2 2MQ red red green gold 5 resistors R21 and R67 to 1 2 Connect R21 from SlB l C to S lC l C Connect R67 ftm SlF 2 C t...

Page 25: ... each of the inner conductors This end of the cable does not get co neqted until later 13 F 2 Connect one end of a 4 1 2 piece of black wire to SlF 6 C i V I 14 V Fi S 1 F 6 Si3 2 Connect a 1 1 2 piece of bare wire from SlC 6 S2 to 15 Fig 2 Strip back the outer insulation 1 1 4 from one end of a 7 1 2 piece of 3 conductor shield cable Twist the shield strands together and cover with a 1 piece of t...

Page 26: ...TB16 XIl R32 R33 R30 R31 R23 R22 XV3 R24 R25 ii J CJI J1234 J567 I XV2 XV1 XV4 37 TBI5 Fig ...

Page 27: ... 1sulator between the input strip and the input bracket IS 1 Fig 3 Mount the three terminal input strip J5 7 as shown Use four 6 31 screws four 6 lockwasher and four 6 32 hex nuts Use a three hole in U ator between the input strip and the input bracket 19 Fig 3 Mount the cable clamp on the upper left hand corner of the front apron s shown Use one 8 32 screw one HSlockwasherand one S 32 hex nut 1 g...

Page 28: ...R32 R33 ffi 10 0 0 eOe Top Shield eOe ICJ iii eOe eOe 0 eOe eOe Fig 4 ...

Page 29: ... respectively along the chassis as shown Push leads tt rough hole S in the front panel between the two rotary switches and behind the slide switch S3 S v Fig 4 Cut all leads on two 6 SKQ blue grey red silver resistors R70 and R71 to 1 2 Connect one resistor from S2B 2 C to S2B 3 S 1 and the second resistor from S2B 9 S 1 to S2A S C 9 Fig 4 Connect the yellow lead from the twisted yellow and grey l...

Page 30: ... R33 PCl R32 TB16 Fig 5 ...

Page 31: ...o R31 1 S1 Cover leads 1 and 7 each with a 1 3 4 piece of spaghetti Connect lead 1 to R33 6 S2 and lead 117 to R33 4 S2 Cover lead 4 with a 1 1 4 piece of spaghetti and connect to R33 5 Sl Cover lead 5 with a 1 3 4 piece of spaghetti and conflect to TB 16 1 C 4 Ii Fig 5 Cut both leads on a 0012mfd 1 2K or 1200mmf disc capaci tor C19 to 1 211 Connect from R31 2 S2 to R31 3 S2 The wiring of the fron...

Page 32: ...R64 XV7 XV5 TB 10 XVll TB6 XV12 XI1 J 1415 TB4 XV8 TB3 TB20 TB2 TB5 XV10 J8910 I J1112 J TB1 J16 TB9 LCD Fig 6 TB7 TB8 XV3 TB21 TBll TB19 TB 18 T B l5 XV4 XV6 TB13 XV2 TB17 XV9 TB 14 C 37 XV1 TB 12 ...

Page 33: ... 17 9 6 Connect one end of a 2 1 2 piece of yellow wire to XV4 4 C and one end of a 5 1 2 piece of brown wire to XV4 9 S2 Twist the wires and run along the chassis as shown Connect the other end of the brown wire to XVl 9 S 1 and the other end of the ye Ilow wi re to XVl 4 C lS iFig 6 Connect a 1 211 piece of bare wire from XVl 4 S2 to XVl 5 S 1 i9 6 Connect a 1 2 piece of bare wire from XV4 4 S3 ...

Page 34: ... XV1O R62 Jl6 TB5 XV7 XV9 TB18 XV3 TB8 C38 XVll Fig 7 ...

Page 35: ...ctto XV12 3 S2 The other lead will be connected later 14 hi9 7 Connect a 6 piece of orange wire from TB6 2 S3 to XV7 9 C 15 trFig 7 Connect a 3 4 piece of bare wire from TB6 1 C to XV11 3 S 1 16 w Fig 7 Connect a 7 piece of orange wire from XV7 9 S2 to XV9 9 C 17 YFig 7 Connect a 6 piece of orange wire fromXVa 9 Sl to TB5 1 C 18 J Fig 7 Connect a 3 piece of orange wire from XVI0 9 C to XV9 9 S2 19...

Page 36: ... J 14 1 5 TB1 TB2 XV10 C29 R57 C30 XV7 R56 XV9 TB19 TB18 C37 XV4 TB21 B15 TB8 R25 Fig 8 ...

Page 37: ...T3 connect the yellow lead to TB2 4 C r the green lead to TB2 3 S 1 the brown lead to TB2 2 S 1 the black lead to TB2 1 C the red lead to TB5 3 S3 the blue lead to XV9 Sl t e brown yellow lead toXV10 7 Sl and the orange lead to TB2 5 S1 I 8 f Fig S Connect the brown lead from hole T to TB11 2 C 9 J Fi Connect 2 1 2 piece Iced wi e from TB9 3 C to TB 11 1 C 10 1 Fig 8 Connect the outer shield from ...

Page 38: ...Wl R c e 9FJ 2 l1 1 II I C ij 1 i l 5 H _ i fi I it l r 7 o c J c S W Y V t r Io c Q d2 IIJ i I iJI J 1 O0 i t 1 z h gJ g r u 12 I dOl rtO1 p i O 110 nO S Ii 1Wl r I 0 I y t J t I t v 1Y I L 7 O l r i ts i1 J J i w u r i H f 0 tot 0 0 o Y J C 1 I j AJ i 1 iJ fiJ v 1 r f i I k l f HJ U w b L Y I g Fig 9 R58 32 R54 R52 R50 C34 R46 C28 36 R40 C26 24 E38 r44 R42 22 18 R24 ...

Page 39: ...3 Connect C35 from XV5 3 C to XV7 6 S3 Connect C34 from XY6 1 C to TB20 2 S3 Connect C36 from XV6 3 C to TB19 1 S3 13 Fig 9 Cut all leads on the two 100KO brown black yellow gold 5 resistors R45 and R46 to 1 2 Connect R45 from XV5 1 C to TBI0 S2 Connect R46 from XV6 3 C toTB19 2 C 14 Fig 9 Cut all leads on the two 100KO brown black yellow gold 5 resistors R44 and R47 to 3 4 Connect R47 from XV5 3 ...

Page 40: ... 1 9 J jtPs C48 1ICJ 11 0 c 7 R34 t 1 I r J Ar3 c 8 fro j rY rfJ f s rl o R27 C U I l L v V jjI I I7 tJ g r c 01 1 r J I y 0 a i L I J J 0 fi 0 t01 R29 R IJ i r 1 t1fjtj 15 0 I rh A 4J 0 n R36 J llil P I If z t JI k S5 en Ji0 J 7 l 0 OJ jJ 1IO1no1 TBJSl r 1 C1 J 1 11 JX V1 j T I I J F 7 l n 0 II oilMJol r T B 8 A 1 j 4 o I OJ TfOUI I IT B 1 5 C 16 JJ ft 11 iD 1f R28 D I II R26 f J I T B 12 Fig ...

Page 41: ...1 C 15 qn Fig 10 Connect the shield from the single conductor shielded cable from SlB 5 to TB12 2 C Connect the inner conductor to TB12 3 C 16 Fig 10 Connect the grey lead from SIB II to TB12 4 C 17 ig 10 Connect the greylead from SlG 12 to TB14 4 C 18 Fig 10 Connect the shield from the single conductor shielded cable from S 1 G 6 to 1814 2 C Connect the inner conductor to TB 14 3 C 19 Fig lO Conn...

Page 42: ...tI tI Fig 11 TB21 R13 TB12 R66 R19 R65 ...

Page 43: ...om hole S connect the white lead to S3 6 S2 th brown lead to S3 4 S2 the blue lead to S3 3 S2 and the green l ead to S3 1 S2 5 Fig 11 Cut both le lds on two IMQ brown black green silver resis tors Rl and R2 to 1 2 Connect Rl from 1B12 3 S3 to 1B12 2 C Con nect R2 from 1B14 3 S3 to 1B14 2 C 6 v Fig 11 Cutailleadson two 0012mfd 1 2KorI200mmf disc capaci tors C41 and C42 to 1 2 Connect C41 from 1B 12...

Page 44: ... g o O O ffi o 8 Pk Tinnerman Angle Bracket Chassis Bezel Control Plate 4 40x1 4 Screws 000 O Screw 8 32 Tinnerman Nut Side Bracket 8 32x3 8 Brown Screw 6 Pk Fig 12 Brown Screw ...

Page 45: ...tain the minimum resistance values indicated do not procede to the next step until the cause is discovered and the condition remedied 12 Fig 12 Fasten the perforated cover to the two tinnerman angle brackets previously mounted on the rear edge of the chassis surface and the two angle brackets on the side brackets using four 8 P K Ty e Z screws 13 Fig 12 Set all controls to the furthest counter clo...

Page 46: ...e used or sufficient packing material Is inserted to keep the instru ment immovable Ship by prepaid Railway Express if possible to the Elec tronic Instrument Co Inc 33 00 Northern Blvd L C 1 New York Re turnshipmentwill be made by express collect Note that the carrier cannot be held liable for damages in transit if packing IN HIS OPINION is insufficient If you are still having difficulty write to ...

Page 47: ...Symbol R22 23 Stock 18045 Schematic R22 and R23 Part supplied may be dual 500KC instead of 750KC This is a direct replacement It does not impair the performance of the amplifier in any way Page 13 va Pin 7 should read 1500 instead of 330KC E 1209 Electronic Instrument Co Inco Long Island City 1 New York ...

Reviews:

No comments

Related manuals for HF-81

C Series C 16 4

Brand: Lab.gruppen Pages: 2

Brand: NAD Pages: 78

Brand: Lanzar Pages: 13

Brand: JL Audio Pages: 17

Brand: VINCENT Pages: 64

JAMP-500HC06-SGR

Brand: J&M Corporation Pages: 6

Brand: Calearo Pages: 23

Brand: Vanguard Pages: 4

Brand: Blackstar Pages: 1

Platinum Hybrid

Brand: Audion Pages: 6

Pro Audio SPA-200

Brand: Crate Pages: 4

The Prelude PC-200

Brand: Harman Kardon Pages: 6

Brand: Texas Instruments Pages: 31

Brand: Echo Pages: 15

Brand: Glensound Pages: 16

Audio Buddy Dual Mic Preamp

Brand: M-Audio Pages: 8

Brand: AMC Pages: 6

Brand: Bugera Pages: 10

Brands by name

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Popular brands

Load more brands