Uploaded May 2023 | Updated September 2026, 3 weeks ago
Looking at a small portable colour TV from the early 90s here. These were quite expensive at the time, particularly if operated from a 12V supply. Badges Realistic (TANDY) this ‘Portavision-30’ TV has a 5” screen and was designed for the UK market using the PAL video format. It’s impressive, given the complexity of early colour CRTs it could be developed into such a small size.
The video looks at the construction of the TV and some interesting behaviours of the CRT itself.
There is also a extra bit on delay lines as used in analogue TVs.
Unfortunately , the video has some flickering images due to the beat frequency between the scan rate and camera refresh.
CONTENT:
00:00 - Intro
01:32 – Construction
02:07 – Fix
02:24 - Assembly
03:52 – Test
04:30 – Shadow Mask
04:40 – Magnetisation
05:30 – Delay line
Looking at a small portable colour TV from the early 90s here. These were quite expensive at the time, particularly if operated from a 12V supply. Badges Realistic (TANDY) this ‘Portavision-30’ TV has a 5” screen and was designed for the UK market using the PAL video format. It’s impressive, given the complexity of early colour CRTs it could be developed into such a small size.
The video looks at the construction of the TV and some interesting behaviours of the CRT itself.
There is also a extra bit on delay lines as used in analogue TVs.
Unfortunately , the video has some flickering images due to the beat frequency between the scan rate and camera refresh.
CONTENT:
00:00 - Intro
01:32 – Construction
02:07 – Fix
02:24 - Assembly
03:52 – Test
04:30 – Shadow Mask
04:40 – Magnetisation
05:30 – Delay line
