Eico HF 87 Schematic

Page 1

CHANNEL 01

.l.

AF MilP OUIPUI @,
INPU'S 1m
@Aosmsto ® [134 v m, 225m
l
i lEVEl CHANNEL N
Omit! lfl'ln
YEL
500K non ..- OR
0 .' .t'
' is .1: I
loo 1:: 3
i ' Ii:
@ - 350 low .; 4:
I 450V m 3?: iii t
OI.
BLUE ft" m- ,
1500
BLUE-YR
© .25 m
l---o COMBINED ; PHASE INV
@aosumm
CHANNIEL O2 F AF RMP AF NIP
WU r @B [cm ®Aosmsto
. F
lEVEl @
® _- who
1th
500K
1 25mm
i Q)
® ® ® ® 3-1; PHASE on
@9665me
® ® ® a so: PARTS usr IO! ALIERNATE
VALU 0 *l'CATION .450v
- - DC COIL IISISTANCI VALUES UNDER ON! OHM SOURCE
NOT SHOWN ON SCHIMATIC DIAGRAM
iUBE PLACEMNI 420V
BOIIDM VIEW f """"" i SOURCE
I
: l @
: : ' .200V
1 I SOURCE
. l
l , I
. 1100 COLD
l __________ J
Toa- a 2on
j):@; 60W: E
: RC RfCEPlAClES
I
: ® 9%
1 1 Jo
0" 0 SW 5 Amp. . DC voltage measurements taken with vacuum tube voltmeter;
ac voltages measured with moo o'nm per volt voltmeter.
RES'SIANCE READINGS N0! USED 2. Socket connections are shown as bottom views. "
ITEM. IUBE Plot Pan T Pin3 * Pint LPins [ Plno Pin? 3. Moasuredvatues arelrom socket pin to common ground,
ECC83 4. line voltage maintained at it? volts tor voltaga roaolngs.
. 0 220K 10K
Ii-_liéfl- 3305- _£K__|mo T '2 . 2 5. Nominal ioleranco of component values makcs possible a
tax on variation at . lStin voltage and resistance readings.
} l.2meg+ 6 18K 1 1220 2 o. All controls at minimum, proper output load connected.
2350 + 00 32500 1|?th 120K [P .2!)
_- M _ o 1. .
2350 or: 1290:: lldflo 120K I? .29
4 4i r- ---~-- ' I
11.20189 1% 18K 1220K 1321: 18K 09
1~- - 1-~--- - i z
2350 on 12500 i 1200 120K IP [.20
2350 00 12900 11400 120x 1? .20
1 wisiunior-fiofiiflwrw. T? m 901m
7
A PHOTOFACI STANDARD NOIATIOH SCHEMATIC
EICO MODEI.

0Howard W. Scum & Co.. Inc. I960

HF-87