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ORDER OF A L IG N M E N T
A c o m p le t e r e c e i v e r a lig n m e n t c a n be m o s t c o n v e n ie n tly
p e r f o r m e d in the fo llo w in g o r d e r :
1.
A u d io T a k e -O f f & R a t io D e t e c t o r
2.
4. 5 M e T r a p
3.
IF C o i l s & M ix e r T r a n s f o r m e r
4 .
O s c & R F S e c tio n s
A U D IO T A K E -O F F & R A T IO D E T E C T O R A L IG N M E N T
E q u ip m e n t R e q u ir e d :
A M S ig n a l G e n e r a t o r :
A c c u r a t e l y c a lib r a t e d at 4. 5 m e
(O p t io n a l)
A d ju s ta b le output
D C M e t e r :
L o w r a n g e e l e c t r o n i c v o lt m e t e r
R e fe r to F ig u r e 4 f o r l o c a t io n o f a d ju s t m e n ts .
1.
If p o s s i b l e it is d e s i r a b l e to a lig n the a u d io s e c t io n f r o m
an
a c tu a l
s t a t io n
s ig n a l, s in c e the 4. 5 m e a lig n m e n t f r e
q u e n c y
w i l l
be
e x a c t .
T h e fin e tunin g t r i m m e r sh o u ld be
tu rn e d
o f
the
s t a t io n s lig h t ly , to p r e v e n t o v e r lo a d in g
r a t io d e t e c t o r .
2.
If a s ig n a l g e n e r a t o r is u s e d , tune it a c c u r a t e l y to 4 . 5
m e and a d ju s t the output to a p p r o x im a t e ly 1 0 ,0 0 0 m i c r o
v o l t s . C o n n e c t the h ig h s id e o f the s ig n a l g e n e r a t o r th ro u g h
a 1000 m m f c a p a c i t o r to the g r id (p in 1) o f the v id e o a m p li
f i e r tube V - 7 ,
and the lo w s id e to c h a s s i s .
a p p lie s
w h e th e r
the. s ta tio n
u s e d .
NO.
TYPE
V-l
6C86
R-F AMP.
I2AT7
V-2
MIXER-OSC.
V-3
6AU6/6AG5
1 ST. IF AMP.
V-4
6AU6/6AG5
2 ND. IF AMP,
V 5
6AG5
3 RD. IF AMP
V 6
6AL5
VIDEO DET.
V-7
6AH6/6CB6
VIDEO AMP.
V-8
6AU6/6AG5
AUDIO DRIVER LIMITER
V-9
6AL5
RATIO DET.
V-IO
6J5GT
AUDIO AMP.
V -ll
6V6GT
AUDIO OUTPUT
V-12
6SN7GT
1 ST. a 2ND. CLIPPER
V-13
I2AU7/6SN7GT V E R T SWEEP GEN.
V-l 4
6W6GT/6AS5
VERT. SWEEP OUTPUT
V-15
6AL5/6H6
PHASE DET.
V-16
6SN7GT
HORIZ. OSC.
V-17
6B06GT
HORiZ. OUTPUT a H.V. GEN.
V-18
6W4GT
DAMPING DIODE
V-19 IB3GT
H.V. RECT.
V-2!
5U4G
L.V. RECT.
*1N60 CRYSTAL USED IN PLACE OF V -6 IN SOME S ETS.
the
T h e fo llo w in g
s ig n a l o r s ig n a l g e n e r a t o r is
FUNCTION
^ ANTENNA
©
©
GET NO 69C70I993-0
FIGURE 4.
TUBE AND ALIGNMENT ADJUSTMENT LOCATIONS
Scanned by mbear2k - Jan 2012
3.
F r o m
e it h e r
s id e
o f c a p a c i t o r C - 5 2 , c o n n e c t an e l e c
t r o n ic v o lt m e t e r to c h a s s i s d e c o u p le d th ru 10K o h m s .
4.
S et the c o n t r a s t c o n t r o l f o r m a x im u m g a in (f u l ly c l o c k
w is e ) .
5.
P e a k L - 2 0 f o r m a x im u m r e a d in g on m e t e r .
6.
P e a k T - 3 p r im a r y (t o p c o r e ) f o r m a x im u m r e a d in g on
m e t e r .
7.
M o v e
the
m e t e r
and d e c o u p lin g r e s i s t o r f r o m C - 5 2 to
ju n c t io n o f R -4 1 and le a d to v o lu m e c o n t r o l .
8.
A d ju s t T - 3 s e c o n d a r y (b o t t o m c o r e ) f o r z e r o r e s p o n s e
on the lo w e s t s c a le o f the m e t e r .
c r o s s - o v e r p o in t on the F M d e t e c t o r c u r v e .
s y m m e t r y o f the c u r v e m a y b e c h e c k e d b y tunin g the g e n e r
a to r ± 2 5 k c f r o m
4 . 5 m e and n otin g the v o lt a g e p r o d u c e d ,
r e v e r s i n g the m e t e r c o n n e c t io n s as n e c e s s a r y .
b a la n c e o f the r a t io d e t e c t o r s y s t e m , the v o lt a g e in e a c h d i
r e c t io n
sh o u ld
b e
a p p r o x im a t e ly e q u a l.
tunin g
o f
L - 2 0
and
the
r a t io d e t e c t o r . If n e c e s s a r y , r e p l a c e the r a t io d e t e c t o r tube
V - 9 (6 A L 5 ) .
T h e g e n e r a t o r m a y b e c a lib r a t e d b y tunin g the
s e c o n d a r y o f T - 3 t o z e r o on a s t a t io n s ig n a l and tunin g the
g e n e r a t o r to the s a m e z e r o r e s p o n s e , n o tin g w h e th e r it i n
d ic a t e s 4. 5 m e .
N O T E :
A s the a d ju s t m e n ts a r e b r o u g h t to r e s o n a n c e , it is
a d v is a b le
to
r e d u c e the s ig n a l g e n e r a t o r outp ut to p r e v e n t
o v e r lo a d in g .
W ith a 1 0 ,0 0 0 m i c r o v o l t s ig n a l fe d in to the g r id o f the
v id e o a m p lif i e r tu b e , and the c o n t r a s t c o n t r o l tu r n e d fu lly
c l o c k w i s e , the v o lta g e r e a d f r o m on e s id e o f c a p a c i t o r C -5 2
to c h a s s i s sh o u ld be g r e a t e r than 5. 0V .
-FINE
TUNING
-CH AN NEL
SELECTOR
INPUT
TOP VIEW
OF
C H A S SIS
C-6
R' F
TRIMMER
MIXER l-F
C&(PRI - TOP)
v> l2
(S E C -B O T )
so sc
L - l l (TOP)
L -I2 (BOT.)
©
- L - I 5
(TO P)
L -I4 (B O T)
Cgp2ND. I-F
LOW
TRAP
L-'8
jx,
L-20
S!P
4.5 MCH
P
-
j
s o u n d
t a k e
o f f
TRAP
-16
^ is )
" S ? - !
f v
T h is c o r r e s p o n d s to the
If d e s i r e d , the
F o r p r o p e r
If n ot, c h e c k the
p r im a r y & s e c o n d a r y o f T - 3 , the
POWER SWITCH a
VOLUME
RATIO
©
0ET ( O )
(PRI. T 0 P ) V V
fSFr. arm
• V -|9|
l
I
r1 -------
T -8
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