National Company NC-88 User manual
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PHOTOFACT*
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TRADE NAME
SELECTOR
SWITCH
National
Model
NC-88
TONE
SWITCH
NATIONAL
MODEL
NC-88
VOLUME
CONTROL
ON-OFF
SWITCH
MANUFACTURER
National
Co.
,
Inc.,
61
Sherman
St.,
Malden
48,
Mass.
TYPE
SET
AC
Operated
4-Band
Superheterodyne
Communications
Receiver
TUBES (Nine)
Types
6BA6
RF
Amp.,
6C4
Osc.
, 6BB6
Mixer,
(2)
6BD6
IF
Amp.,
6AL5
Det.
-AVC-
Noise
Limiter,
12AX7 CW
bsc.-AF
Amp
.,
6AQ5 .Audio Output, 5Y3GT
Rectifier
POWER
SUPPLY
TUNING RANGE
105
/
130
Volts
AC-50
/60
Cycles
Band "A"
-540-l600KC
Band
"B"
-1.
6-4.
7MC
RATING
.56
Amp
. @
117
Volts
Ac
Band
"C"-4.7-l4
.
0MC
Band "
D"-14.0-40MC
HOWARD
W.
SAMS
&
CO.,
INC.
Indianapolis
5,
Indiana
"The listing
of
any
available
replacement
part
herein
does
not constitute
in
any
case
0 recommendation,
warranty
or
guaranty
by
Howard
W.
Sams & Co., Inc.,
as
to the quality
and
suitability
of
such
replacement
part
. The numbers
of
these
ports hove
been
compiled from information furnished
to
Howard
W.
Sams & Co.,
Inc., by the manufocturers
of
the particular
type
of replacement port listed."
"Reproduction or use, without express permission, of editorial or pictorial can·
tent,
in
any
manner
,
is
prohibited.
No
patent
liability
is
assumed
with
respect
to
the
use
of
the information
contained
here
in. Copyright
1954
by
Howard
W.
Sams & Co.,
Inc
., Indianapolis
5,
Indiana,
U.
S.
of
America.
Copyr
ight
under
In
·
ternational
Copyright Union.
All
rights reserved
under
Inter·American Copyright
Union (1910>
by
Howard
W.
Sams & Co.,
In
c."
Printed
in
U.
S.
of
America
DATE
3-54
SET
233
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cor-
CO
FOLDER
7
o
CBAND
CHASSIS
BOTTOM
VIEW-CAPACITOR
IDENTIFICATION
~
0
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,
,
,
,
,
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I
,
,
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,
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,
,
,
,
1
______
---
@,
1
RfAMl'
@6BA6
200V
@
..
~
MIXER
@6BE6
1ST
IF
AM~
@l
i----~--[ill---l
@
6B.rD6-;;;;;,,-_-+r_--_-...,-~--@J---l
-:---------~;::::::;
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h
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@)
:
I-!
BAND
SELECTOR
I!Wl1'CB
SHOWN
IN
"A"
BAND
SWITCH
SEQUENCE:
1·
"A"
BAND
2 _
"8"
BAND
@
15K
!
~l~:
~
i :
-------------
__________________
1
______
@-
_____
- -
---------~--::--------
- -
~---.
i
~:':.~:'.=
IF=455KC
I
,
,
----------------------@----------------------------------------------~
THE
COOPERATION
OF
THE
MANUFACTURER
OF
THIS
RECEIVER
MAKES
IT
POSSIBLE
TO
BRING
YOU
THIS
SERVICE
@i
"
Mro
AI'
AMP
@a12AX7
SW
ON
VOL CONT
®
lOOVAC
~Ih
I-----~
lOOVAC
S40V
l40V
REeT
@5Y3GT
~
---r®
TO
FILS
'1
r®
-::-
-=F
A PHOTOfACT
STANDARD
NOTAnON
SCHEMATIC
©Howard W. Sams & Co., Inc. 1954
r-<""
0 STANOB't
....
VI
V2
v,
V4
V5
V6
r--
V7
v 8
V9
RESISTANCE
READINGS
,
....
PI."
PI,2
PI,'
PI,4
""5
.....
.BA.
I.Bldeg
00
OD
.m
ffllfl"
.=
6C4
j22Kn
INF
.m
o.
to=
471:0
6BE6
4=
..
0.
00
.Ill
t12KD
t160m
.BDO
1.6Mog
00
.10
on
t'''''
tlOOKn
6BD6
I.SMag
on
...
on
.10
I
t4.'Ko
tlO5KQ
~.-.
on
r--"
270m
On
on
B.5Meg
on
l2AX7
t5.0K~_
lOOKO
00
On
on
t720KO
OAQ'
500KU
2700
.10
00
t2.3KO
to""
6Y30T
INY lMeS
.-
INF
900_"
on
95.
~
':t~'l\VJ:lil&
~Wt1l;rot
qro·Y&.ND
.
.f.
MICASU1tED IN "CW"
POSITION
..
SKN81'rlVlTY
AT
MINIMUM
(FULLY
COUNTER CLOCKWISE)
•
SICNSITMTY
AT
MAXIMUM
(FULLY
CLOCKWISE)
""'7
""8
PI,
•
~,*n-
on
35.
i:-
f:°:!cn
..
=
lOMeg
OD
.10
50QKO
.ill
lMeg
VOLTAGE
&
RESISTANCE
MEASUREMENTS
TAKEN
ON
HANn
"A"
UNLESS
OTHERWISE
NOTED.
PAGE
3
1.
DC
voltll8e melLllllremerlia t""en with
neuum
rub
...
"rrn,.IN,
ACvollaguQteaSlll'edatlOOOohmapervulr.
2.
lluckl!l
eon1lltctimBaN
aholm
lUI
bottom ylvwa,
3.
Me
...
"rO'd
yaluea
arefromaoeket
pin
I"~"n'n""'
"
.......
.
~.
L.I~~
yolta!:e
J(la\lItalnad
lit
II'
voila
lor
.,,11l1li"
.....
,,''11.
5. Nominal toler;lJl(e
on
comPORent Vailll!8
mak~"
I,,,~~,
..
t~
~
...
laIlnnol
..
l,.,lnvoltapandrea1.t.l'C
.....
oIl
....
s.
~!i::~~
..
t.:!~
at maxilll\llll, noBill"..L .ppllod
I",
.,,11
...
2ND
IF
AMP
DEl·Ave
@ 6BD6
r-------------------,
®
..
6AL5
r-..""--..;l-..,lm@].----1!_-I""""':.eGI9-1
___
"""
l~i'ff
I t
lt~L
.~'V.l
~~!I
I-SV"'='"
!
@.
I~~
~
I
MMF
@---
-1
47K
, ,
~
l
____
jt_J
~
8
tl
~
@l'~
~
@)
.-
AUDro
OUTPUT
@6AQ5
..,
....
HEM
PHON<
JACK
233-7
PAGE 4
CHASSIS BOTTOM VIEW-RESISTOR IDENTIFICATION
88-JN'l:3:GOW
'lVNOIJ.VN
ALIGNMENT
INSTRUCTIONS
ALIGNMENT INSTRUCTIONS-READ
CAREFULLY
BEFORE
ATTEMPTING
ALIGNMENT
Volume
control
should
be
at
maximum position. Output
of
signal
generator
should
be
no
higher
than
necessary
to obtain
an
output reading.
Use
an
in-
sulated
alignment
screwdriver
for
adjusting.
Remove external antenna and
turn
sensitivity control
fully
counter clockwise.
Set
the
I!
receive-standby" switch
to
"receive"
position.
Set
ANL-off
switch
to I'offll position.
Set
AM-CW
switch
to
"AM"
position.
Place
the
band
spread
pointer
on
the
"set"
mark
(near
86
on
the log
scale),
Turn
on
receiver
and
test
equipment. Allow
15
minute warm
up
period.
IF
ALIGNMENT
----
DUMMY
SIGNAL SIGNAL
BAND
RADIO
OUTPUT
GENERATOR GENERATOR
SWITCH
DIAL
ADJUST
REMARKS
ANTENNA
COUPLING
FREQUENCY
POS.
SETTING
METER
1. .0lMFD High
side
to lug on
stator
455KC
"A"
Tuning gang
Across
voice
Al,A2,
Adjust
for
maximum deflection.
plates
of
center section
of
(400'l.Mod) fully open
coil
A3,A4,
center
section
of
main
A5,A6
tuning gang. Low
side
to
chassis.
2.
Check
alignment
of
BFO
oscillator
by
placlog AM-CW
switch
to
CW
position.
With
pitch
control
tune BFO
for
zero
~at
with
signal
generator.
Zero
beat
should
occur
when
red
dot
on
pitch
control
is
at
the
top
dead
center
position.
If
necessary,
set
pitch
control
to
place
red
dot,
at
the top
center
position.
Adjust
A7
for
zero
beat.
Return
AM-CW
switch
to
"AM"
position.
RF
ALIGNMENT
Incorrect
mechanical
calibration
is
indicated when
the
frequency
readings
are
off a
certain
equal
linear
amount
on
all
bands. With
the
main tuning gang
fully
closed
place
t)1e
pointer
at
the
first
marker
on
the
"C"
scale
(just
to left) of
4.
7MC
marker.)
With
the
band
spread
tUlling gang fully
closed
set
pointer
to the
zero
marker
on
the
log
scale.
The
oscUlator
operates
on
the
high
side
on
the
"A",
"B"
and "e" bands and
on
the low
side
at
the
"0"
band.
DUMMY
SIGNAL SIGNAL
BAND
RADIO
OUTPUT
GENERATOR
~REE~~~~g~
SWITCH
DIAL
ADJUST
REMARKS
ANTENNA
COUPLING
POS.
SETTING
METER
300[1 High
side
thru
300[1 to
left
1600KC
"A"
I600KC
Across
voice AS,A9
Adjust
for
maximum deflection.
Carbon
hand
antenna
terminal.
Low
coil
Resistor
side
to
chassis
(connect
link
from
terminal
"G"
to
middle
terminal).
" " 600KC " 600KC "
AID
Adjust
for
maximum deflection,
Repeat
steps
3
and
4.
" "
4.0MC
"B"
4.0MC " All,A12 Adjust
for
maximum deflection.
6.
" " 1.6MC " 1.6MC "
A13
Adjust
for maximum deflection.
Repeat
steps
5 and 6.
" " I4.0MC
"C"
14.0MC " AI4,AI5 Adjust for maximum
deflection,
If
Al4
has
two
peaks
use
the peak
closest
to
minimum
capacity
0 H Al5
has
two
peaks
use
the
peak
closest
to maximum
capacity.
" " 5.0MC " 5.0MC " AI6
Adjust
for
maximum
deflection.
Repeat
steps
7 and S.
" " 30;OMC
"D"
30.0MC " AI7,AlS Adjust
for
maximum
deflectiono H
A17
has
two
peaks
use
the peak
closest
to
maxi-
mum
capacity.
H
AlB
has
two
peaks
use
the
peak
closest
to minimum
capacity.
10. " " 15.0MC " I5.0MC " Al9
Turn
Al9
counter
clockwise
as
far
as
possible
then
turn
clockwise
until
second
peak
is
ob-
tainedQ
Adjust
for maximum deflection on
second
peako
Repeat
steps
9 and 10.
PAGE
6
."
;a..
Q
In
c;o
....,
-
.....
....
....
....,
=
r-
=
....,
....
-..0
PARTS
LIST
AND
DESCRIPTIONS
T
UBES
(SYLVANIA, GENERAL
ELECTRIC
,
WE
STINGHOUSE)
ITEM
No.
USE
VI
RF
Amplifier
V2
Oscillator
V3
Mixer
V4
1st
IF
Amp.
V5
2nd
IF
Amp.
V6
Oet-AVC-
Noise
Limiter
V7
CW
OscUlatOr-
AF
AmplUler
VB
Audio Output
V9
Rectifier
ITEM
RA
TIN
G
No.
CA
P.
VOLT
f-
CIA
,20
450
B
dO
450
C ,20 450
C2 25
SO
C3
220
SOO
C4 10000
CS
10000
C6 10000
C7
SIO
SOO
C8 220
SOO
C9
470
SOO
CIO
. 1000
SOO
CU 3000
SOO
C12
1000
SOO
CI3 10000
CI4 10000
CIS 10000
CI6 10000
CI7 10000
CI8 10000
CI9 10000
C20 10000
C21
10000
C22 10000
C23 .
01
400
C24 10000
C25 .
01
400
C26 47
C27 270
C28 220 500
C29 .01 400
C30 270 500
C31
10000·
C32A .005
B
]250
C
C33 10000
C34 .
04,
400
C35 .1 400
C36 .047 400
REPLACEMENT
DATA
RETMA
NATIONAL
STANDARD
BASE
NOTES
PART
No.
REPLACEMENT
TYPE
6BA6 6BA6 7BK
6C4 6C4
6BG
6BE6 6BE6 7CH
6B06 6B06
7BK
6B06 6B06
7BK
6AL5 6AL5
61.lT
12AX7 12AX7
9A
6AQ5 6AQ5 7BZ
5Y3GT 5Y3GT 5T
CAPACITOR
S
Capacity values given in the rating column
are
in
mid. lor Electrolyt
ic
and Paper Capacitors,
and
in
mm
ld.
lo
r Mica and Ceramic C
ap
acitors.
REPLA
C
EME
NT
DATA
NATIONAL
AERO
VOX
CENTRA
LAB
COR
NE
LL
·
ERIE
MALLORY
PART
No. P
ART
No. PA
RT
No.
DUBILI
ER
PART
No.
PART
No.
PART
No.
H32S-2
AFH3-36
C027
FP376.5
E33B-4 PRS50/25 BR255 TC36
J665-44
1479-00025 5R5T25 MCB240
K946-2 BPO-OI
00-103
TM5S1
8U-0I
OC-5U
K946-2 BPO-OI
00-103
TMSSI 8U-OI OC-511
K946-2 BPO-OI
00-103
TM5S1
8U-0I
DC-5U
J665-S7
J665-44
1479-0002S SRST2S MCB240
J665-SS
J665-70
1464-001 IRSDl MCE2SI
J666-30 1464-003 1R503 MCE461
J66S-
71
1464-001 IRSDl MCE2S1
K946-2. BPO-OI
00-103
TM5S1 6U-OI
OC
-5U
K946-2 .BPO-OI
00-103
TMSSI
8U-0I
OC-SU
K946-2
BP
O-OI
00-103
TMSSI
8U-0I
OC-SU
K946-2 BPO-OI
00-103
TMSSI 6U-OI
OC-
5U
K946-2 BPO-OI
00-103
TMSSI 6U-OI
OC-
SU
K946-2
BP
O-
OI
00-103
TM5S1 8U-OI
OC-SU
K946-2
BP
O-OI
00-103
TM5S1
8U-0I
OC-SU
K946-2 BPO-OI
00-103
TM5S1
6U-OI
OC-5U
K946-2 BPO-
OI
00-103
TM5S1
8U-OI
OC-5U
K946-2 BPO-
OI
00
-
103
TMSSI 8ll-01 OC-511
Q963-19 P488-01
06-103
PTE4S1 GP2-333-103
PT4U
K946-2 BPO-OI
00-103
TM5S1 8U-0I
OC-5U
Q693-19 P488-01
06
-
103
PTE4S1
GP2-
333-103
PT4U
08250-44
7
S127
08-270
GPLK
-270 UC-5427
J665-47
1479-00025 5R5T25 MCB240
J665-44
1479-00025 5R5T25 MCB240
Q693-19
P488-0I
06-103
PTE4S1 GP2-333-103
PT4U
J665-47
1479-0002S 5R5T25 MCB240
K946-2 BPO-OI 0 0 -
103
TM5S1 8U-OI
OC-5U
~"R983-1
~
'PA-1l2
-2
~
'PC-71
I 1
'1406-02
K948-2 BPO-OI
00-103
TM5S1 8U-OI
OC
-5U
Q893-28
P488
-
04
7
OF-S03
PTE4S47
PT4147
Q893-34 P488-1
PTE4PI
PT401
Q693-28
P488-047
PTE4S47
PT4147
, Items C32A,
C32B,
C32 C and R32A, R32B
are
combine
d
In
one unit.
When
replacing
Items
separalely
C32B and C32C
should
total
250
MMF.
SP
RAGUE
PA
RT
No.
TVL-37BO
TVA-1306
SHK-SI
5HK-SI
SHK-SI
MS-21
MS-23
MS-31
SHK-SI
SHK
-
SI
5HK-SI
SHK-SI
5HK-SI
SHK-SI
SHK-SI
5HK-SI
SHK
-SI
5HK
-SI
4TM-SI
5HK-81
4TM-SI
5GA-Q27
4TM-SI
5HK-SI
'104C5
5HK-SI
4TM-847
4TM-PI
4TM-S47
NOTES
-
'"
»
><
.......
CHASSIS-
TOP
VIEW
t
III
CO
PARTS
LIST
AND
DESCRIPTIONS (Continued)
CONTROLS
REPLACEMENT
DATA
ITEM
RATING
NATIONAL
IRC
ClAROSTAT
CENTRALAB
MALLORY
INSTALLATION
NOTES
No.
RESIST·
WATTS
PART
No.
PART
No.
PART
No.
PART
No.
PART
No.
ANCE
RIA 500Kn L K347-1 Ql3-133 AG-60-Z-
B-60-S
U-48 Volume
.
B
Shaft
Not Req. Not Req.
RS-2
Not Req. Not,Req.
Attach
tc RIA
C Switch Not
Req.
76-1
SWB
Not Req. US-26
Attach
tc RIA
R2A
1500n i K915-16 Qll-110
AG-ll-S
B-6
U-6
Pitch
B
Shaft
Not Req. Not Req.
FS-3
Not
Req. Not Req.
Attach
to R2A
R3A
LOKn
2 K349-3
A43-LOK
RlO,OOOL
Sensitivity
(Wire wound)
B
Shaft
Not Reo.
FS-3
DS36
Attach
tc R3A
RESISTORS
REPLACEMENT
DATA
ITEM
RATING
NATIONAL
IRC
NOTES
No.
OHMS
WATT
PART
No.
PART
No.
REPLACEMENT
DATA
ITEM
RATING
NATIONAL
IRC
No.
NOTES
OHMS
WATT
PART
No.
PART
No.
'R4
470Kn >
J569-57
BTS-470K
R5
68n
J J569-11
BTS-68
R6 47Kn f
J569-45
BTS-47K
R7
68n
J569-11
BTS-68
R8
2200n
J569-29
BTS-2200
R9 15Kn I J571-39 BTA-15K
RIO
33n
t
J569-7
BTS-33
Rll
220n
J569-17
BTS-220
Rl2 150Kn f J569-51 BTS-150K
Rl3
220n
f J569-17 BTS-220
Rl4 270Kn
J569-54
BTS-270K
Rl5
2200n
J569-29
BTS-2200
Rl6
100Kn I
J569-49
BTS-IOOK
Rl7
680n
J569-23
BTS-680
RlS
lOOKn
J569-49
BTS-IOOK
Rl9
2200n
J569-29
BTS-2200
R20 270Kn
J569-54
BTS-270K
R21
270Kn
J569-54
BTS-270K
R22 IMeg I J569-61
BTS-IMeg
R23 IMeg 1569-61
BTS-I
Meg
R24
2.2Meg
J569-65
BTS-2.
ZMeg
R25 150n t J569-15 BTS-150
R26
47Kn
2
J569-45
BTS-47K
R27 15Kn I 1571-39 BTA-15K
R28
LOOKn
!
J569-49
BTS-IOOK
R29
47Kn
I J571-45 BTA-47K
R30 10Meg t
1569-73
BTS-LOMeg
R31
470Kn H569-57 BTS-470K
R32J
250Kn f } • R9S3-1
B 500Kn
..
R33
270n
I J571-IS BTA-270
R34
22n
I J571-5
R35 100Kn I J571-49
BTA-LOOK
R36 150Kn 1 J569-51 BTS-150K
R37
6800n
J569-35
BTS-6S00
R3S
2.2Meg
1569-65
BTS-2.2Meg
R39
2000n
10
M707-2
13/4A-2000
R40
4700n
2
J572-33
BTB-4700
R41
4700n
t
J569-33
BTS-4700
R42
LOn
i J569-1
BTS-LO
R43
Ion
..
J569-1
BTS-LO
* Items R32A, R32B, C32A, C32B, C32C
are
combined
in
one unit.
TRANSFORMER
(POWER)
REPLACEMENT
DATA
ITEM
RATING
NATIONAL
STANCOR
MERIT
Halldorsor,t
TRIAD
No.
PART
No
.
PART
No.
PART
No.
PART
No.
PART
No.
PRI.
SEC.
1 .
SEC.
2
SEC
TI
1t1
7VAC I620VCT:l
Gi)5VAC16.3VAC
K-316-2 PC-S408<2}@
P-3151<2}
@
P9304(2)@
R-9A®
@
• 56A .064ADC
'2A
Gil
2.
6A
K-316-5
(i)
cD
A
ternate
pOwer
~.
®
Drm
new mounting' holes.
@
Tape
center
tap
on
6.
3V
winding.
TRANSFORMER
(AUDlO
OUTPUT)
REPLACEMENT
DATA
ITEM
RATING
NOTES
NATIONAL
STANCOR
MERIT
Halldorson
TRIAD
No.
IMPEDANCE
DC
RES.
PART
No.
PART
No.
PART
No.
PART
No.
PART
No.
PRI.
SEC.
PRI.
SEC.
T2
4.
6Kn
la.In
I
295n
I
.56n
K313-3
A-3877
A-2930 Zll07
S-3X
CD
Drill
one new mtg.
hole.
PARTS
LIST
AND
DESCRIPTIONS (Continued)
COILS
(RF-IF)
REPLACEMENT
DATA
ITEM
USE
DC
RES.
NATIONAL
MEISSNER
MERIT
MILLER
No.
NOTES
PRI.
SEC.
PART
No.
PART
No.
PART
No.
PART
No.
LLA
Ant.
Coil
30n
2.Sn
Band
"A",
540-1600KC
B
Ant.
Coil
.9n
.sn
SB:1517 Band
"B",
1.6-4.7MC
C
Ant.
Coil
.9n
on
Band
"C",
4.7-14MC
L2
Ant.
COil
.10
on
SB:1519 Band
"D",
14-40MC
L3A
RF
Coil
30n
2.Sn
Band
"A"
B
RF
Coil
.9n
.sn
SB:15IS Band
"B"
C
RF
Coil
.9n
.10
Band
lie"
L4
RF
Coil
on
SB:1520 Band
"D"
L5
Osc.Coil
10
1.5n
SB:1573-1 14-1060 BC-3S1
71-0sc.
Band
"A"
L6
Osc.
Coil
.sn
1.20
SB:1574-1 Band "B"
L7
Osc.
Coil
.In
.In SB:1575-1 . Band
"C"
LS
Osc.
Coil
.In
on
SB:1576-1 Band
"D"
L9
1st.IF
Trans.
20n 20n
Q242-2 16-5740
BC-339
912-C2
LI0 2nd.1F Trans
20n
20n
Q242-2 16-5742
BC-339
912-C2
Lll
3rd.IF
Trans
Isn
Q242-1 16-6770 •
BC-376
12-C6
Inclndes
47Kn
resistor
L12
BFO
Coil
6n
SA:5361
and
diode
load
filters
•Cut out
chassis
metal StrlP, use adaptor plate
and
add
47KO
resistor
externally.
Tapped
Gil
4.
an
ITEM
PART
NAME
No.
M!
Dial
light
M2
Tuner
M3
Tuner
M4
Switch
M5
Switch
M6
Switch
TrJmmer cap
Trimmer cap
Trimmer cap
Trimmer cap
Knob
Knob
o
MISCELLANEOUS
NATIONAL
PART
No.
FI36-11
P705-2
P706-2
E230-2
S245-1
L209-2
S662-1
DS32-5
E3U-2
E311-1
A: 5292-2
SA:9305
NOTES
*47
bayonet
General
coverage
(3
sections
at
13-454MMF each)
Bandspread
(3
sections
at
LO-37MMF each)
Stand
by-receive
(toggle-SPST)
Band
selector
(3)
ANL-oIf, tone
Hl-L),
AM-CW
(slide
SPDT)
Antenna-air
variable
(5-50MMF)
RF
-mica
(4)
used
(2.
2-40MMF)
Osc-ceramlc
(2)
used
(5-20MMF)
Osc-ceramic
(2)
used
(2. 5-6MMF)
Large
(3)
used-·antenna, main
and
band
spread tuning
Small
(4)
u;:;ed-sensitivity,
band
select,
pitch, volume
a
TUNING
GANG
fULLY
CLOSED
TUNING
GANG
FULLY
OPEN o
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