Left side:
- Tuner 3122 128 64171
- IF unit: 3112 248 56820
- TBA120AS
Center:
Main Power Supply;
Line oscillator TBA920T
Right:
Deflections and line output transistor BUY71 (TOSHIBA)
This is a directly mains power supplyed chassis.
Note the Ballast resistor which is employed in parallel with Mains Stabiliser circuit.
TBA920 line oscillator combination
DESCRIPTIONThe line oscillator combination TBA920 is a monolithic
integrated circuit intended for the horizontal deflection of the black and white
and colour TV sets
picture tube.
FEATURES:
SYNC-PULSE SEPARATION
OPTIONAL NOISE INVERSION
GENERATION OF A LINE FREQUENCY VOL-
TAGE BY MEANS OF AN OSCILLATOR
PHASE COMPARISON BETWEEN SYNC-
PULSE AND THE OSCILLATOR WAVEFORM
PHASE COMPARISON BETWEEN THE OS-
CILLATOR WAVEFORM AND THE MIDDLE OF
THE LINE FLY-BACK PULSE
AUTOMATIC SWITCHING OF THE VARIABLE
TRANSCONDUCTANCE AND THE VARIABLE
TIME CONSTANT TO ACHIEVE NOISE SUP-
PRESSION AND, BY SWITCHING OFF, POS-
SIBILITY OF TAPE-VIDEO-REGISTERED RE-
PRODUCTION
SHAPING AND AMPLIFICATION OF THE OS-
CILLATOR WAVEFORM TO OBTAIN PULSES
FOR THE CONTROL OF DRIVING STAGES IN
HORIZONTAL, DEFLECTION CIRCUITS
USING EITHER TRANSISTORS OR THYRISTORS.
BUY71 Transistor Datasheet. Parameters and Characteristics.
Type Designator: B
UY71Material of transistor: Si
Polarity: npn
Maximum collector power dissipation (Pc): 40W
Maximum collector-base voltage (Ucb): 2200V
Maximum collector-emitter voltage (Uce):
Maximum emitter-base voltage (Ueb): -
Maximum collector current (Ic max): 10A
Maximum junction temperature (Tj): 200°C
Transition frequency (ft): -
Collector capacitance (Cc), Pf: -
Forward current transfer ratio (hFE), min/max: 8MIN
Manufacturer of BUY71 transistor: TI
Package of BUY71 transistor: TO3
Application: Power, High Voltage, General Purpose
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