UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Were there any all-valve PAL colour-TVs?

Vintage Engr · 12th Aug 2019, 4:37 pm

I worked on the very first colour TV's available to the public in 1967.
As far as I can remember, all the released U.K. manufactured sets were hybrid.

The Bush/Murphy range and the Baird, & GEC all used a plethora of valves, with generally just the decoders & sometimes audio o/p being discrete transistors.

I seem to remember the BF115 transistors in the Bush decoders being liable to fail frequently. We were always being warned about he X-rays from the PD500 shunt stabilisers, some of which had a lead - glass shield around them.

Some wag once commented that he wasn't sure whether it was better to wear it, rather that fit it over the PD500.. Generally, the valve sections were fairly reliable, it was the early transistors that failed.

I'm not sure how stable a reference oscillator at 4.43361875 Mc/s would have been...

Happy days!

Dave.

12th Aug 2019, 4:37 pm	#27
Vintage Engr Heptode Join Date: Jan 2008 Location: Shrewsbury, Shropshire, UK. Posts: 841	Re: Were there any all-valve PAL colour-TVs? I worked on the very first colour TV's available to the public in 1967. As far as I can remember, all the released U.K. manufactured sets were hybrid. The Bush/Murphy range and the Baird, & GEC all used a plethora of valves, with generally just the decoders & sometimes audio o/p being discrete transistors. I seem to remember the BF115 transistors in the Bush decoders being liable to fail frequently. We were always being warned about he X-rays from the PD500 shunt stabilisers, some of which had a lead - glass shield around them. Some wag once commented that he wasn't sure whether it was better to wear it, rather that fit it over the PD500.. Generally, the valve sections were fairly reliable, it was the early transistors that failed. I'm not sure how stable a reference oscillator at 4.43361875 Mc/s would have been... Happy days! Dave.