A
—
INTRODUCTION
The G22K511
television receiver is designed for reception of both
colour and monochrome pictures on 625 lines. A 22" rectangular
shadow mask cathode ray tube is employed around which are
fitted a pair of degaussing coils. These automatically degauss the
tube each time the receiver is switched on. The main chassis is
mounted vertically at the rear of the receiver, and when servicing
is necessary, it can either be hinged backwards or removed com-
pletely. The tuner is a UHF/VHF integrated type, operated by
four push-buttons which can be set to receive any 625-line channel
on UHF or relay channel on VHF. By removing one screw, a part
of the front escutcheon comes away, revealing easy access to the
grey scale and dynamic convergence controls. This enables the
more difficult setting up to be done from the front of the receiver.
Special features include a fully pluggable I.F. panel to facilitate easy
servicing, and a new black level clamp circuit to ensure faithful
reproduction of low key scenes.
The G25K512
is a 'Deluxe' version of the above receiver employ-
ng a 25" push through cathode ray tube. Housed in a consolette
tyle cabinet and finished in teak veneers, it has two single doors
which are secured by ball catches when closed.
B
—
SPECIFICATION
Mains supply
240
volts a.c. only
Valves
Type
Function
V1706
A56-120X 22" Shadow-mask C.R.T.
or V1706
A63-120X 25" Shadow-mask C.R.T.
V2001
PFL200 Luminance output and sync. separator
V2002
EF80
Line sync. amplifier
V4001
PCF802 Line reactance and oscillator
V4002
ECC81
Field oscillator
V4003
PCC85
Field buffer/fly-back suppression
V4004
PL508
Field output
V5001
PL509
Line output
V5002
PY500
Boost diode
V5003
PD500
Shunt stabiliser
V5004
GY501
E.H.T. rectifier
V5005
EY51
Focus diode
V7001
EF183
1st chroma. amplifier
V7002
EF184
2nd chroma. amplifier
V7003
PCC85
Chroma. A.G.C./colour killer
V7005
PCF200 R-Y amplifier/clamp
V7006
PCF200 G-Y amplifier/clamp
V7007
PCF200 B-Y amplifier/clamp
V7008
EF184
Burst amplifier
V7009
PCF802 Reactance/reference oscillator
VA V7010
PCL86 A.F. amplifier/output
Semi-
Type
Function
conductors
T1321
AC128
T2140
BF194
T2141
BF194
T2142
BF196
T2143
BF196
T2144
BC148
T2145
BC148
T2146
BC148
T2147
BC148
T2624
BF197
T2755
BF173
T3401
BF180
T3402
BF182
T3403
BF183
T3495
BC108
T7011
BF195
T7012
BF195
T7013
BF194
T7014
BF194
T7015
BC107
X1101
BY127
X1102
BY127
X1103
BA148
X1104
BA148
X1105
BYX10
X1106
BA148
X1292
BA148
X1293
BA148
X1294
BA148
X2151
0A91
X2152
BA154
X2153
0A91
X2530
AA119
X2531
AA119
X2625
0A90
X2756
0A90
X3496
BZY88
X4140
BA148
X4141
BA148
X4142
BYX10
X7315
0A90
X7316
0A85
X7317
0A202
X7318
0A95
X7319
BA100
X7320
AA119
X7321
AA119
X7322
0A91
X7323
BA148
X7324
X7325
BA154
X7568
0A95
X7569
0A95
X7570
0A95
X7571
0A95
X7628
BAY38
X7629
BAY38
X7630
BAY38
X7631
BAY38
X7632
BAY38
X7655
0A95
X7656
0A95
Circuit protectors
Fuses
Type
FS1107
3A
FS1108
Thermal
FS1109
250mA
FS1110
Thermal
FS1114
Thermal
Drop-off resistors
R2111
1.5K52
R4135
12052
Safety resistors
R4083
3.3K52
R7148
1052
R7151
1052
R7263
1ic52
R7293
18052
Spark gaps
SG10981
SG1099 f
E.H.T.
Loudspeaker
Sound output
Dimensions
G22K511
G25K512
Weight
G22K511
G25K512
li
Convergence clamp
1st sound I.F.
2nd sound I.F.
1st vision I.F.
2nd vision I.F.
Luminance phase splitter
Luminance A.G.C. amplifier
Black level clamp
Chroma. pre-amplifier
3rd vision I.F.
Chrominance amplifier
R.F. amplifier
Mixer
Oscillator
A.G.C. amplifier
B-Y pre-amplifier
R-Y pre-amplifier
}Bistable oscillator
Identification signal amplifier
Mains rectifier
Mains rectifier
L.T. supply rectifier L.T.
supply
rectifier
–
ve supply
rectifier Supply for black
level clamp
}Auxiliary d.c. supply to C.R.T.
1
A.G.C. delay
Black level clamp
A.G.C. rectifier
1
F.M. ratio detector
Luminance demodulator
Chrominance demodulator
Tuner supply stabilisation
} Line discriminator
Fly-back pulse clipper
Chroma. noise clipper
}Burst keying
Burst blanking
Bias clamp
}PAL switch (180°)
Identification signal gate
Stabilised H.T. supply
4.43 MHz crystal
Beam current limiter
B-Y demodulator
R-Y demodulator
Anti-lock-out
Chroma. A.G.C. demodulator
Burst demodulator
Ref. oscillator A.G.C.
Ref. oscillator grid clamp
Location
Mains supply
Main H.T. supply
Field output
Main H.T. supply
Mains transformer
Luminance output
Field output stage
Line reactance stage 1st
chroma. amp. stage
2nd chroma. amp. stage
Burst amp. stage
A.F. output stage
C.R.T. base panel
25kV
6" x 4" elliptical, 5ohm
impedance 2.5 watts
Height
Width
Depth
(Inc. backplate)
28"
2W
31-i"
23"
861bs.
1291bs.
181'
33f"
(Inc. legs)
Page Three
Summary of Contents for G22K511
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