Describe the effects of the following in the TV receiver i. CONTROL ii. COLOUR TINT – NABTEB QUESTION

1. CONTROL: For the adjustment of TV signals; colour, sound and picture as desired

2. BRIGHTNESS

1. A brightness control will vary the overall illumination
2. It automatically adjusts picture-tube brightness to compensate for different room-ambient lighting conditions
3. It adjusts the voltage difference between the grid and cathode of the CRT
4. It decides the number of electrons that pass through the grid aperture and ultimately strike the phosphorescent screen
5. Turning it in a clockwise direction increases the screen illumination and vice-versa.

3. COLOUR TINT: Also known as Hue, it refers to the actual colour of objects. It can be used to adjust for correct flesh tones of the face.

4. COLOUR KILLER CIRCUIT: It is the circuit that shows the stage of the chrominance section that cut off the chroma amplifier during mono chrome broadcasts.

5. FINE TUNNING

1. Termination or keeping of the overall noise level as low as possible
2. Ensuring greater stability
3. Avoiding interference
4. Ensuring great selectivity so as to discriminate against unwanted image frequencies or stations on adjacent bands.
5. So that the desire station can be obtained