Re: How good were 1950's/1960's Band 1 TV receivers?

Graham. wrote:
"Ian Edwards" <red--NOSPAM-squirrel@xxxxxxxxxxxxxxxxxxxxxx> wrote in message

Again using the AFAIR, the final generation of Bush (RBM) monochrome solid-state TVs had a switchable 4.43 MHz trap - button was on top next to the station selector buttons. This would be circa 1972-73.

I don't remember that. Are you sure it wasn't an AFC button, which might have
had the same subjective effect?


It was definitely a trap. The sets may have had a separate AFC button as well, or the AFC switch could have been operated by the flip-up cover over the tuning buttons, can't remember exactly - it was 35 years ago! They certainly had varicap tuners. The effect on the testcard frequency gratings meant you could see right up to 5.5MHz, albeit with dot-crawl patterning in areas of high colour saturation - (bearing in mind that you're looking at a monochrome TV) - like the yellow tablecloth and red dress on the girl in Testcard F.

I guess it was a feature added so the customer could switch the trap out when monochrome pictures were being broadcast - do you remember the days when broadcasters actually turned the colour burst off during mono transmissions?

I've been trawling the Internet looking for old press adverts from the time, so far without success. The sets that I remember were 24" mono, had painted cabinets, solid-state circuitry and the controls were all on the top of the cabinet to the RHS.

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Ian Edwards
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