Time has never been an issue, since they have been talking about this for years - and I strongly suspect that the cost would be regarded as far less (if at all) 'prohibitive' if the BBC actually wanted to continue their long-wave broadcasting.New valves could be manufactured but cost and time to make the valves would be prohitives
In any event, as I said before, IF they wanted to continue, it would probably make more sense for them to replace the whole transmitter with a 'modern technology' one, rather than try to just replace the output stage valve(s). At the time, I 'agreed' that a replacement transmitter could cost 'millions' but, on reflection, I'm far from convinced about that ....
.... I imagine that I would be able to build them a 200 kHz transmitter with, say, 100 W, or maybe 'a few hundred Watts', output,probably for just a 'few hundred quid' (a thousand or three at the very most) - so it would only be necessary to add a driver or three and an output stage to get up to 500 kW (if they really needed that much). Indeed, it would seem that 500 kW transmitters for frequencies down to at least 4 MHz can be bought 'off the shelf' (although I suspect that they are 'made to order'), so I doubt that it would be far from impossible to shift that down to frequencies less than an order of magnitude lower.
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