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BOTTOM VIEW OF CHASSIS
I.F. Amplifier:
The intermediate frequency amplifier consists of 2 W -6K7
tubes in a two stage transformer coupled circuit. The wind-
ings of all three I.F. transformers are resonated by fixed
capacitors and are adjusted by moulded magnetite cores
(both primary and secondary) to tune to 460 Kc. A third
winding, L15, in the
first
I.F. transformer
is
placed in
series with the main secondary L14 when the fidelity con-
trol switch S-7 is thrown to the "broad" position
(see
schematic diagram), thereby increasing the coupling be-
tween the primary and secondary circuits with consequent
broadening of the band width of the I.F. amplifier.
The
increased band width of the I.F. amplifier therefore causes
less attenuation of the higher audio modulation side band
frequencies, permitting higher fidelity reception.
Second Detector and A.V.C.:
The modulated signal, as obtained from the output of the
I.F. system, is detected by one of the diodes of a W -6H6
tube, Audio frequency secured by this process is passed on
to the control grid of a W -6C5 for amplification before
reaching the driver stage. The d -c voltage which results
from -detection of the signal, is used for automatic volume
control.
This voltage, which develops across resistor R21
is applied as automatic control grid bias to the R.F. first
detector and I.F. tubes through a suitable resistance filter.
The other diode of the W -6H6 tube is used to supply
normal bias to the first detector and
i -f radiotrons until
such time as the rectified signal voltage is great enough to
overcome the normal bias voltage and start the automatic
volume control action.
A portion of the range selector switch (S-11) is used to
change the minimum bias on the radiotrons controlled by
the AVC voltage, so as to reduce the minimum bias and
increase the sensitivity of the receiver on the "medium
wave" and "short wave" positions.
Tuning Indicator 1.F. Adjust
No test oscillator or output indicator
is required.
With the antenna connected to
the receiver tune in a fairly strong signal on
the broadcast band (not necessarily a local
station).
Without watching the resonance
indicator, tune the receiver by ear very care-
fully to secure the best quality of reproduc-
tion.
Leave the receiver tuned to this point
OS
MFD
ANT
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TO RTIAR34
BLACK -ANT)- TO C4
YEI10W
TOaim LF TRANSE
BUS-e) OS
I -ID MME.
BUS
D2 1-2 MME
BIDS
C -I
I -I2 MME
BUS-ATO C 6
CM
450
MMF
Cü
20.
MME.
612
k5
-05 AFD
100.D00
ONO
-4.- TO C-24
LAPP
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ur 1'
C
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Lana
OSC.
10 C27
YELLOW
NOTE:-
THE SIX TERMINALS SHOWN
DOTTED ARE FASTENED TO THE
COIL TUBE ONLY.
ment:
and adjust the two magnetic core screws of
the fourth (tuning indicator) I.F. transform-
er to secure maximum resonance indication
of
the W -6E5 tuning tube.
The receiver
may now be tuned by an unskilled operator
using
the W -6E5
resonance indicator to
secure the same degree of fine tuning as a
skilled operator secures without the use of
the indicator.
TO PLATE
SLUE
OF EAT'1.
BUS
C -ID 1-12 MME
RED
TO R4
BUS-(O] C-9
I-12 MMF
BUS -SOL C B
1 2 MMF
BUS
C-17
1300
MME
BUS
C-16
3400
622 I-2 MMF
021
I-12 MME.
-Bus-*C-201-2MMF
YELLOW -..nOE
CAT 6Ml7'OOE
á.
a
;+
SWITCH SECTIONS ARE
SHOWN IN MW POSITION
CHOS C-19
Range Selector Wiring Diagram
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