Re: Bush Dual Standard Colour Restoration
The CTV174D is indeed quite rare now, as is the Philips G22K503, as they were for people who needed a dual standard colour TV. Unlike the CTV25 and '500 they both looked modern with 'push through' 22" tubes.
The CTV174 used the Mk3 timebase like yours and a similar power supply and IF/audio unit. However unlike the 19" CTV162D with its folded up panels it used a completely redesigned decoder and had a solid-state RGB stage. This gave much improved reds over the earlier design.
In fact I would say the CTV174 gave far superior pictures to the A823 which was muddy by comparison.
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