Yeah, I saw the transistor switches, it's the fine detail of what was happening round the valves where I thought I could trace some sort of alternate path. But I couldn't make sense of it.
Signal comes in through h9bb and connects to grid of v1a and also grid of v1b via R260, but in the schematic I'm looking at R260 is marked 0 jmp which I assume to be a link with 0 ohms. I then trace the same connection through R240, which is marked n/u which I assumed is not used ie no component just a track in this variant. I then trace through R261, which is another link, and on to h9ba. But thinking again maybe n/u means absent, ie open circuit, in which case it makes more sense.
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