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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Who remembers how bad analogue television was?
Date: Sat, 1 Mar 2025 20:52:46 -0500
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"Jeff Layman" <Jeff@invalid.invalid> wrote in message news:vprrbe$3in6g$1@dont-email.me...
> On 28/02/2025 03:03, KevinJ93 wrote:
>> On 2/27/25 12:45 PM, Martin Brown wrote:
>>> On 27/02/2025 19:58, KevinJ93 wrote:
>>>> On 2/26/25 8:52 PM, Sylvia Else wrote:
>> <...>
>>>>
>>>> Are you sure that 1984 date is correct? By 1970 in the UK colour TVs
>>>> used transistor signal processing stages and many had already changed
>>>> to transistors for the power stages such as line and frame output as
>>>> well as using chopper stabilised power supplies.
>>>
>>> The first two colour TVs I recall owned by friends or family were about
>>> the time of Apollo 8 in 1968. Memorable for the Earth rise shot. Both
>>> were entirely valves and my uncle's caught fire leaving a nasty brown
>>> burn mark on their wool carpet and smoke damage on the ceiling.
>>>
>>> The earliest was at a school friends house and was in pastel shades pre
>>> Nd glass. It was in colour but only just... Joe 90 launch was the first
>>> programme I can recall watching there in colour. Test cards in shops
>>> don't count.
>>>
>>> I'd believe 1974 as a date for hybrid colour TVs that almost worked
>>> correctly and didn't need a service engineer visiting them every other
>>> week. By 1980 I'm pretty sure they were almost entirely semiconductor
>>> based.
>>
>> My father bought a Ferguson 19" colour TV at the end of 1970 that was
>> fully semiconductor (it was my first term at university and he got it
>> just before I came back for Christmas). It seemed to work fairly well -
>> he would tinker with it but I don't remember it needing any significant
>> repair. I gather it was one of the first such sets.
>
> The first domestic UK colour sets were valve-based. However, it wasn't long before transistor sets came in. See page 22 at 
> <https://americanradiohistory.com/UK/Practical-Television/60s/Practical-Television-1968-06.pdf#search=%22practical%20television%22>. 
> This was the June 1968 edition of Practical Television, and it refers to the new 19" Marconiphone Model 4701 as being "fully 
> transistorised".

I think they worked with a Texas Instruments facility in the UK where the necessary transistor was produced to make it possible to 
do the line scan and EHT without valves.
R2008B I think. Doesn't seem possible to find any data on it now.
https://www.google.com/search?q=R2008B+npn+transistor

> More details can be found in Practical TV July and September 1967. What's amazing to me is the price - "284 guineas". So just 
> short of £300 in 1968; equivalent to £4500 today!!!
>
> -- 
> Jeff