Operating instructions
TO V/ /P/N
6)
THRU C3
ro v2
(Ptr
6)
.HRU ClO
-ì
REAR
-l
I
I
I
rO
ANTENNA
9EC
r
8 E.7)
2
2
12
REAR
I
ì'
NOTES:
I.
UNLESS
OfHERWISE
INDICATEO:
ALL
RESISÍANCE
VALUES
ARE IN
OHMS.
ALL CAPACIfANCE
VALUES
ARE
IN
lì.41C R0lV
ICR0FAR
A0S,
K
-
ì,00O
oHMS
SWITCH
SECTON
DÉSIGNATED NO,ì
IS
NEAREST
THE
KNOB ENO.
SWITCH
SECTIONS,
AS VIEWED,
ROTATE COUNfERGLOCKWISE.
o.
The
signals
amplified
by V1 are couplecl
inductively
to the
second r-f amplifier
(fig.
43,
par.
52d). On
band 1, the
signals developed
across
the
secondary
of
lvinding C
of
T2
are
supplied
to
the
gricl
(pin
6)
of tube V2
through
section
5,
rear, of
31 ancl
capacitor C10.
The
su'itch also
shunts
tuning
capacitor
C18
across
the
transformer.
The tuning
circuit
of this
bancl
consists
of a
25-ppf fixecl
capacitor,
con-
nected
internalll'
in the transforrner
assembllr,
]IAI{UAL-PRESET
TU\IING capacitor
C18,
runcl trimmer
C9.
Resistor
R4 and
the avc
cir-
,rrit
provide
a
cl-c return
for the
grid
circuit.
\\-hile
band
1 is
itt nse,
section
5, front,
of the
,Ì.\ND
SW.
srvitch
(frg.
2a)
grounds
the sec-
'rlaries of
the
first
r-f
plate
coils
not
in Llse-
thi-q
case,
u'inding
D of
T2 and
windings
D
.,Ì
E of
T6.
+0
4.
Figtur"e
21. Rudto
Recei'uer
R-17IlURR,
sintpli/íecl contro! circuit
of BAl''D SIf .
stoitch.
Zr. The second r-f
amplifier utilizes
a
7L4
pentode
tube
(fig.
43). Filament
voltage
for
the tube
is obtained
from the
1.4-volt d-c
poten-
tial
at
pin
11
of J4. Capacitor
C12
bypasses
the
fllament
for rf to
ground.
Screen
voltage is
supplied
through
voltage-dropping
resistor Rb
from the 90-vo1t
potential
present
between
pin
6
of J4 and
ground.
Capacitor
C13
places
the
screen
at
r-f
ground potential.
Plate
voltage
is
obtained
from
pin
6 of J4,
through voitage-
dropping
resistor
R6, the C
rvinding of
T3,
and
section
6 of
BAND SW.
switch
S1. Resistor
R6 and
capacitor C14
form
a
plate-circuit
de-
coupiing
netrn'ork.
c. Tube
V2 amplifies
the
r-f signals
and
de-
velops these signals
across
the ttntuned
primary
of TB
(winding
C).
The signal
is coupled
in-
AGO 3134