Eico HF-20 Instruction Manual Download | Manualshive

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Summary of Contents for HF-20

Page 1: ...HIGH FIDELITY AMPLIFI ER MODEL HF 20 ...

Page 2: ...ning to own a tape recorder THE BASS AND TREBLE TONE CONTROLS are of the new feedback type for exceptionally low distortion and wide frequency range Theydo not affect the volume or Inter act with each other providing the easiest possible con trol settings As turnover on both ends varies with the amount of boost and attenuation boost or cut at the ex tremes of the audio range Is possible without af...

Page 3: ... a nail to 4 4 pierce the centers of the five 5 9 diameter holes for the controls and the two small holes for mounting the control plate to transfer their locations to the console panel be neath 3 Remove the panel template 4 Drill the holes for the panel controls only the two small holes which have been marked are for wood screws b Amplifier mounting In console 1 Pull off the con trol knobs a seco...

Page 4: ...mum and the LOUDNESS control to maximum Playany record ng on your phonograph and turn up the level control to obtain on ordinary listening level Without touching the LEVEL or LOUDNESS controls turn the SELECTOR to TUNER and ad ust the volume control on the tuner to obtain approximately the same loudness level as was obtained from the recording In the case where the tuner has no output level contro...

Page 5: ...ons section When selecting Inputs which do not have level ad usts such as tv or a crystal cartridge connected to the AUX Input It may be desir able to set the LEVEL control to zero beforehand and then bring up the LEVEL control to obtain the desired list ening level to avoid blasting Note that the LEVEL con trols affects the output to tape recorder available at the TAPE OUT jack but that the LOUDN...

Page 6: ...Epic COL RIAA I Esoteric RIAA RIAA I Folkways most COL Bass 42 no change 1 Good Time Jazz RIAA Bats 41 RIAA Haydn Society COL RIAA 1 Record Label Equlllzatlon Since Sprl 1954 L Otseau Lyre LON RIAA London fftr LON RIAA Lyrlchord old COL or RIAA RIAA Lyrlchord new COL Bass 42 RIAA Mercury RIAA Bass 41 RIAA MGM RIAA RIAA Oceanic COL Bass 42 RIAA Pactflc Jazz RIAA RIAA Philharmonic RIAA Bass 41 RIAA ...

Page 7: ... output disconnect the phono Input cable from the amplifier and short the phono Input ack to chassis If the hum disappears the trouble Is not In the amplifier but In the phonograph or In the connection to the amplifier The cause of phonograph hum may be a metal pick up arm not grounded to the cable shield try a good single ground con nection to the cable shield from turntable frame pick up arm and...

Page 8: ... watts and place the solder on the joint not on the iron so that the solder is melted by the heat from the joint itself Do not remove the soldering Iron until the solder flows and check to see that the resulting joint is smooth and shiny when the solder has cooled There are two extremes to be avoided too little heat and too much heat If too little heat is applied the joint will appear pitted and g...

Page 9: ......

Page 10: ...a 5 length of yellow wire Connect the yellow lead to XV5 7 S and the brown lead to XV5 2 S Twist the two leads Connect the yellow lead to XV4 9 C Pass the brown lead through XV4 5 C to XV4 4 S Fig 1 Following the above procedure cut and strip a 3 length of yel low wire and a 5 length of brown wire Connect the yellow lead toXV4 9 S and the brown lead to XV4 5 S Twist the two leads Connect the yello...

Page 11: ... B the outer insulation is stripped back 1 the braid shield 3 4 and theinnerin su lotion 3 8 Fig 2 Connect the inner leads of theffour cables end B so that one connects to each of the following four switch terminals IF S 2F S 1 1F S 12F S Fig 2 Cut a 5 piece of bare wire Wrap this wire one turn around the exposed outer braid on the B end of each of the shielded cables now connected to 2F IF 12F an...

Page 12: ... lockwashers Fig 3 Mount the terminal board TB3 as shown Use two 6 32 screws two 6 hex nuts and two 6 lockwashers Mount a one post right terminal strip TB2 under one lockwasher as shown Fig 3 Mount the dual input jack J5 6 as shown Use four 6 32 screws four 6 hex nuts and four 6 lockwashers Use an insulating bakeI ite between the dual jack and the chassis Mount a one post left terminal strip TB1 u...

Page 13: ...R14 R2 R3 R1 R44 R45 C23 ...

Page 14: ...mmf capacitor C16 from TB3 4 S to TB2 C Fig 4 Connect an 10 black lead fromTB2 S to XV8 3 C Run the lead along the chassis as shown PRE AMPLIFIER WIRING Fig 4 Connect a 1 138K resistor R41 from XVI 8 C to ground lug A S Fig 4 Connect the blue lead from S1 12C to XVI 8 S Fig 4 Run the free end of C25 under R4I and connect to XV1 1 C The capacitor should be perpendicular to the chassis Use spaghetti...

Page 15: ...C5 R7 ...

Page 16: ... S to TB9 2 C Fig 5 Connect one end of a 47K resistor R17 to TB7 4 C Pass the other end through XV3 7 C and connect to XV3 1 S Fig 5 Connect a 4 7K resistor R18 from TB7 4 C to TB7 3 C Fig 5 Connecta5000mmf20 capacitor C9 from TB7 3 toXV3 7 Fig 5 Connect a 2 blue lead from C27 1 C to TB7 4 S Fig 5 Connect o33IC1 2W resistor R43 fromC27 4 S to C27 3 C Fig 5 Connect a 47K resistor R13 from C27 l C t...

Page 17: ...R30 R27 TB8 R29 R28 Cl 5 XV5 XV6 ...

Page 18: ...re wire around the exposed shield at end A and solder Connect the inner lead of end A to J7 1 S and the bare wire to J7 2 S Connect the inner lead of end B to R10 3 S Fig 6 Insert a 3 B grommet into the hole at the rear of the chassis Pass the line cord through this grommet Knot the line cord inside the chassis 3 from the end Connect one lead to J9 l S and the other lead to J9 2 S FINAL STEPS You ...

Page 19: ...9 If the amplifier ts not to be Installed In a console Insert the rubber feet In the openings provided in the bottom plate Whether the amplifier Is to be Installed in a console or not mount the bottom plate on the chassis using 4 8 32X3 B on the front and rear flanges and4 8 32X1 on the side flanges It is essential that the bottom plate be mounted on the amplifier at the start and during the proce...

Page 20: ...ges starting at the Input and working step by step toward l h rSf PU i LEVEL LOUDNESS controls to maxtmum 10 and BASS and TREBLE controls to their mid points 0 Use a l 9 1 f a l w PPl ed hy E CO 377 Sine Square wave Audio Generator addition use out of 0 4 viS whtaK P Tr L 0b i a leV 004volt M to PHONO Input 1 from an audio generator out frHe nerator1 Lhl J h hT J ea ur lowe AC volts range of your ...

Page 21: ...S FOR VOLTAGE 4 RESISTANCE CHARTS H Heater pin all biased 35 volts de above chassis ground to prevent heater cathode current Heater AC voltages as follows a VI V2 V3 V4 6 3VAC from pin 9 to pins 4 5 b V5 V6 6 3 VAC between pins 2 8 HR Heater pin of Rectifier V7 5VAC between pins 2 4 8 check only with V7 socket empty Not connection to tube element or not contact on socket UNLESS OTHERWISE INDICATED...

Page 22: ...ion NC means no connection SERVICE If trouble developes in your instrument which you can not remedy yourself write to our service department listing all possible Indications that might be helpful If desired you may return the Instrument to our factory where It will be placed In operating condition for 9 50 plus the cost of parts replaced due to their being damaged In the course of construction NOT...

Page 23: ... X 3 3 28 10426 R4 43 res 33KQ 1 2W 10 0 00 2 41016 screw 4 40 X 1 4 8 10427 R5 res 1 2KQ 1 2W 10 Br R R 1 41026 screw 4 40 X 1 4 2 11523 R6 8 res 68KQ 1 2W 5 CD 2 41027 screw wood 4 X 3 3 2 18020 R7 pot IMG bass 1 41028 screw 8 32 X 1 4 11531 R9 res 470KG 1 2W 5 CD 1 42000 washer lock 3 B 5 18008 RIO pot 500Ki CT w switch treble 1 42001 washer flat 3 3 5 10410 Rll res 100KQ 1 2W 10 Br B Y 1 42002...

Page 24: ... R23 i S00ICQ C T twitch trablt R24 100KD I 2 W 10 R25 3 3X0 1 2 W 10 826 47X0 1 2 W 10 R27 coapantrol SOOKO loudnaa R20 m 10X0 1 2W rat 4700 1 2W rat 47X0 1 2W rat 4 7X0 1 2 W rat 22X0 1 2W ra 22X0 1 2 W rat 22X0 1 2W rat 33X0 1W rat 470X0 1 2W rat 470KQ 1 2 W rat 47X0 2W rat 47XQ 2W ra TOOKO 1 2W ra 100X0 1 2 W 10 10 10 10 10 oBlditd 10 Matchod 10 10 10 10 10 wetcfwd 10 rcicM 5 CD 5 CD XOa PtKll...

Page 25: ... COLOR CODt FOR TUBULAR CERAMIC OltltCTR C CAPACITORS JAN COLOR COOt FOR FIMtO CMRANK DItLCC TRtC CAPACITORS RADIAL trpg NON INSULATED ARIAL TTPt INSULATOR SIGNIFICANT FIGURCS FIRST SECOND CAPACITANCE TOUHAHCI TEMPERATURE COEFFICIENT MULTIPLIER ALL SOO HOLTS RESISTORS TOLtRAMCt AULTIPUt R Significant FtCURt RASA RADIO AAAMUFACTORSRS ASSOCIATION JAR JOINT ARAAF NAUr CAPACITORS MOL TIPLItR COLOR JAN...

Page 26: ...R22 R5 R6 8 R9 Rll R12 R13 17 R25 26 R15 32 R16 R18 R19 20 R22 R23 24 R27 28 34 35 R29 30 R36 R37 R38 22 mf red red yellow black yellow 02mf 20 000 mmf 20K 05 mf green black orange black yellow 2200 mmf 0022mf 2 2K 3300 mmf 0033mf 3 3K Imfr 20 brown black yellow black yellow 02mf 20 000 mmf 20K 5000 mmf 005mf 5K 1 mf 10 brown black yellow white yellow 330 mmf 00033 mf 5000 mmf 005mf 5K 850 mmf 000...

Page 27: ...he above listed changes Page 1 last step in Output Stage wiring Resistor R48 is 3500 10W not 3500 7W Please also make the following changes in your instruction book white pages Parts list of opposite schematic the third item in the second column reads 14700 R48 res 3500 7W 10 1 It should read 14302 R48 res 3500 10W 10 1 The parts list under the schematic reads R48 res 3500 7W 10 It should read R48...

Page 28: ...2 22506 cap disc Q2mfd 20 22507 cap disc 2200 mmf 10 C3 20042 cap disc 05mfd 20039 cap lmfd 400V C5 22508 cap 3300 mmf 22518 cap 2700mmf 10 C9 2251 1 cap disc 5000 mmf 20 22514 cap disc 850 mmf 10 R18 10430 res 4 7KQ 1 2W 10 10442 res 1 5KQ 1 2W 10 Br G R ADD R49 new component 10428 res 47KQ 1 2W 1 0 Y V O In row beginning 22508 strike out C5 and change quantity from 2 to 1 Add new C5 as a separat...

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