Eico 378 Specifikace Strana 1

operationPRELIMINARY: Be surealltubesarefirmlyseatedintheirsocketsandthatthetubeshieldsaremaking goodcontactwiththeirbaSes.AsinitialadJustments,setthe

BASS CONTROL 1, BASS CONTROL 2 (CONCENTRIC):The plus sign on the right side of the dial indicates thatclockwise rotation from the mid-point (0) of eit

CHECKING A TYPICAL TUBE STAGE1. Check tube.2. Check plate and cathode resistor.3. Check coupl ing capacitors for leakage or short.4. For output stage,

SYMPTOMAmplifier causes power line fuse toblow. Power line fuse blows againwith VII & V12 out of their sockets.Amplifier causes power line fuse to

VOLTAGE AND RESISTANCE CHARTTUBEPIN# OPERATING VOLTSOPERATING VOLTSSIGNAL VOLTSOHMSAT NO SIGNALAT 14W OUT(1 kc) at 30W OUT UN IT DISCONNECTED(DC UNLES

EL84/6BQ5V9, V10EZ81/6CA4VII, V124&54&5* = 60 cycles0 6.12. 7 14. 7 . 03 *filament (OVDC; 6. 3VAC between pins 4 & 5)340KQ340KQ165Q50 Q335

SECTIONAUXAAUX B AM-FM FM-MUL TI MICPHONOTAPEINPUTSELECTOR11- 11-SWITCHS 12-6-10-11- 10-11- 10- 1210- 10- 11-10-11-3- 74-11 1 -4-2-4- 3-4-3-6-10-10- 1

REPLACEMENT PARTS LISTStock'SymbolDescriptionStock'Description20050Cl,cop. , paper, .25mfd, 200V~1\TTB15,terminal strip,2 past right23014C3,

Jl0J13J12Jl1';'... Cl",,-,-c4...c6... C7~C8=CIO- ClI..:.CJ2-c13...C14-CJ5-'J6,...CJ7-CJ8--C19--C20...C21-C22-C23~C24"

generaldescriptionGENERALThe EICO Model HF-81 is a complete high fidelitystereo-phonic control center and a pair of14wattamplifiers, allon one chassis

(jW) SpOJOj OJ::J!W L ::: (jww) SpOJDj OJ::J!W-OJ::J!W 000000(~W) wlj06aw L :: (~)I) swljolPI OOOL :: (~) swljo 000 000-IOS 6u!aq tU!o! aljt puo tJod

TB20to.)TB21XV12 -XVllTBll8 ''-'. ) !'Fig. 1-$- -$-TB19XV10XV9TB 14TB18TB5TB13TB17TB4TB1TB2XV8-Jl11213.J8910TB3XV6

BELOW CHASSIS ASSEMBLY9. hlg. 1. Mo,nt the 5 wew te,mlnall"""d, TB2, '" ,hawn. U,e two#6-31 screws, two #6 lockwashers and t

PREWIRING OF SELECTOR SWITCHTurn the switch to its maximum counter-clockwise position. The switch is shownin the figure from the rear view. The exact

9. J) Fig. 2. Strip back the outer insulation 1 1/2" from one end of a 10"piece of 3 conductor shielded cable. Twist the shield strands toge

TB16XIlR32R33R30R31R23R22XV3R24R25(ii) J)CJI ~=$=J1234J567I 'XV2XV1XV4(37TBI5Fig.

TOP OF CHASSIS ASSEMBLY11. (\.fi Fig. 3. On the power transformer, 11, cut both green leads, the red-yellow lead and the white lead to 2 1/2"; bo

R32R33ffi10\0 0eOeTop ShieldeOe~ICJ~iiieOeeOe0 eOeeOeFig. 4

TOP OF CHASSIS WIRING1. (v) Fig. 4. Run the four conductor cable from switch wafer, SlD and thethree conductor cable from switch wafer, S 1 F along th

SPECIFICATIONS *Output Power: 28 watts continuous; 56 watts peak.1MDistortion(60c&7kcat4:1): 2% at 28 watts;0.5%at 10 watts.Frequency Response: (2

...R33PClR32TB16Fig. 5

Two printed circuit plates are soldered to the dual potentiometers. One printedcircuit plate, PC 1 gets connected to the potentiometers, R31 and R33 n

R64XV7XV5;:; TB 10XVllTB6XV12-$-XI1J 1415 TB4XV8TB3TB20TB2TB5XV10 J8910, IJ1112.J .TB1J16TB9LCDFig. 6TB7TB8 XV3TB21TBllTB19TB 18T B'l5XV4XV6TB13X

BELOW CHASSIS WIRINGI. jy;g, 6. F'om the powe' t,on,ro,mer, n, connect one g'oon leod toR64-l (C) and the other green lead to R64-3 (C)

-$-XV1OR62Jl6TB5XV7XV9TB18XV3TB8C38XVll-$-Fig. 7

1. Fig. 7. From the power transformer, Tl, connect the red-yellow andwhite I "ads to ground lug "A" (C) at the power transformer.2. (IJ

-$-J 141 5TB1TB2XV10C29R57C30XV7R56XV9TB19TB18C37XV4TB21B15TB8R25-$-Fig. 8

1. (d) Fig. 8. Cut the negative (-) lead on the 30mfd electrolytic capacitor,C39, tol 1/4". Connect to TBI0-1 (C).2. ,,) Fig. 8. From the output

R59(31R55R48R53R51R49(25(33(35R45C27R47R43C23R41R39(21C17TB4 TBl TB20TB3 TB2~\ ((I) ~I -,~~: ~~ Lj1rdIif~t"' j.. ,) ~ ~:i ~ ~ Hi' ~&ap

1. (\)Fig.9. Connecta21/2"pieceofgreenwirefromR24-5(Sl)toXV4-7(Sl).2. (1) /Fig. 9. Connect a 9" piece of black wire from XV5-8 (C) to T84 (C

mechanicalinstallationGENERALa)HEATDISSIPATION(VENTILATION): In common withotherelectronic equipment, the HF-81 produces consider-able heat in normal

J~,1 0 R~9 J13 R\((')) ~~r ~ ~ j. -\.~~ ~00: ~~~f:jJ:J~.. T B 1 3~~ /' ~ . ~" J/ia TB17il;L , ~ , \" ~' -r;~:' : ,it\~ &

! /Ii' 1. Fig. 10. Cut all leads on two 100KQ(brown,black,yellow,silver) ')resistors, R34 and R35, to 1/2". Connect R34 from XV4-1 (S2)

tI.)tI.)Fig. 11TB21R13TB12R66R19R65

1. (V!Fi9. 110 Cut all leads on two 25mfd electrolytic capacitors, C5 and, to 1" and cover each with a 3/4" piece of spaghetti. Connect the

...~g~..~...~oO~Offi'o::. ,::.#8 Pk.Tinnerman Angle BracketChassisBezelControl Plate#4-40x1/4 Screws000O~~~\~~:Screw#8-32 Tinnerman NutSide Brack

FINAL STEPSof the cabinet from the outside, using a small screwdriver. The flat portionshould be the actual resting or contact surface.You have now co

Remove the backings from the two large labels suppl ied and place them on theoutside surface of the bottom plate. See figure 4 for placement of small

MODEL HF81-2 ADDENDAPlease make the following corrections to your HF81-2 book:Page 7C, Step 7.Page 16, Symbol #R22, 23 Stock #18045Schematic R22 and R

electricalinstallationThe HF-81 can be used in two ways for a stereophonicsystem. In all cases, plug monophonic sources andonetrackof monophonic/stere

CH.IHIGHLEVELINPUTSCH.ITAPEOUT1-__SPEAKERCH ICH.ILOWLEVELINPUTSFIG.1fMONOPHONICTUNER,TAPE, TVSEP1---_SPEAKERCH.2CH.2TAPEOUTCH. I HIGHLEVELINPUTSCH. IT

FIG.2cCHECKAMPL.2CH.2 LOWLEVELINPUTSCH.2HIGHLEVELINPUTSCH.2TAPEOUT_SPEAKERCH.2CH. IHIGHLEVELINPUTSCH.ITAPEOUTFIG.2dSTEREONORMALCH.ILOWLEVELINPUTSCH.2L

CH.lLOWLEVELINPUTSFIG.2gMONOPHONICPHONOCH.2LOWLEVELINPUTSCH.lHIGHLEVELINPUTSCH.2HIGHLEVELINPUTSCH.lTAPEOUTCH.2TAPEOUTSPEAKERCH.lf---SPEAKERCH.2c) INPU

TO MAG. INPUT 2B-1~~~~-~,-(8-ITO MAG. INPUT 1STEREOMAG.CARTRIDGEFIG. 35)AUXILIARYB'l,AUXILIARYB2: Same as for AUX-ILIARYAI,AUXILIARYA2 above.6) A