Eico HF 81 Schematic

Page 2

TAPf OUTPUT

: AMP OUTPUT @ '
PHASE INV 22K 51:
AEcm @ @ m4 .
v l II "
all" m
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' SPEAKER MATCHING
3 150K 1
$ng @é i mm man
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I 320
INK
mm I é a
m 1 80
& Im'li Y : 0
_ 17w 5
f l
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1 REDYEI.
: 1* II
: amount
Ln]. _________
@ 333-3: . , cmrzu
i-I. . IF" 1' : : :fifi SELECT 011th
limimnf ft; ® @ELM
Bis-Is A m v
lmag COMMOR
SEPARATE --°I
I TAPE OUTPUT
It 3_ .--..._. 2:22-1:22?
tar mp AF AMP ' OUYPUT ® m 5,,
AF AMP PHASE liW flu
AECCII - BEECH
a $2 51:31:58 ® 4Q; [cm ® @ r33;
. -0-- ~
5 40v .1101- i ._ 500K 1 75v 1 . "E
, w a 250K am 10!:
"mi F1®'T ''''''' 7 """ 5 _2_'"'
a 1 ET: 330mm: i 3.5 5mm MAICH mo
1 7 mm. WARD
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h» I I
320
' INK M 9' a '0
gm § § m 1 @ m a
2am I mom
I t -l- '0 3
'Jmflysv I gm" i @nm *3 9
__ : 100K: 175V 43
_ : : -
I I _________ 'Y
: o- If H. : "4"" RED EL
I 2 mm-m "WM 6 l - CHANNEL 2
I I
--------------- P------r---
q . ®
1 m 1 M .OUTPUT
"" ® [LN
.52 1.8
1 --~- YLL _ _ __ 1} _.f _ _____ -i ---o 340v
E9 meg :. F . SOURCE
OFF-0N SWIICH ygf _ 'i I ___ 330V
OMREBE I RECI I I I Mfl _- 0 N SOURCE
CONTROL I
, ./ : ~--~->---- -o 280V
. . I SOURCE
@ 2 __ a- 150m.
4 . : - - L a ------- - I75V
'I]- 03 now ' 1 - a - _ SOURCE
I LT @I : i 5v
:\ i ' :1 . SOURCE
,2 4 . 3
ac ascamcu l L,
9 m , _ .x @e-mw i @Aawmiéoc- we
; T 1-IUM ,J_ 0
._.._. .. . ApJus - 1W 3W @fi-I 11mm @Bllflmld
:2 7 l 1-7- i if '9'
El ? a T ZIE ~
RESISTANCE READINGS N 1 .Y
Pin} mm MS I Pint: [ Pin} . Pins Pinl
47030 25:: 250 1295K lmeg 2M0 25-
33009 25 35° ' 175K 0 13m 35 1. DC voltage measurements taken with vacuum tube voltmeter;
I AC voltages measured at Hm ohms per volt.
100K 35" 250 I75" 250 13m" 259 2. Socket connections are shown as bottom views.
. -_ _. -------r----'--- - 3' Measured values are from socket pin to common negatiw.
' 1650 250 250 NC t 190:: 79 I350 4. Line voltage maintained at 11? volts tor voltage readings-
" 5. Nominal tolerance on component values makes possible a
' 1650 250 2'50 NC 1 1500 I? 1350" variation of '15'sin voltage and resislance readings.
: ' 6, Volume control at maxumum, no siqnal applied tor voltage ..
71130 250 i 250 1 85K lmeg 22000 250 meamrements.
' sum 25:: I 250 tli'SK on 13000 250
i 0 DC can RESISTANCE VALUES unon on! mm
-' 100K 25 250 "5" 250K 18000 25 4 N07 snown on scnmnlc DIAGRAM
3 5 35 35 J W 3 50° ARROWS 0H comums mmcn: cmcansz ROTATION
+____, " " ""-""""_"* "'"""""*_'"# [CONTROL vlzwm FROM SHAFT END}
i 1650 2m 2:0 19 1150:: inc 13509
-I t _ T T .-
t-I 1 1 NC I 350 NC NC
A ; 1 1 '1 NC 330 NC NC
{PENU INC UPON THE CONDITION OF THE ELECIROLYT IC IN THE CIRCUIT.
i2.
EICO

MODEL HF-8I