[Amps] Grid Vs cathode drive

[Peter Chadwick]

Looking back through my old  (late 1950's and 1960's)ARRL handbooks, the 100watt rig was pretty standard - Heath, Hallicrafters, Collins. So I think it would have stayed pretty much that way, rather than a high gain amp.
There are no restrictions in the UK, except that commercially produced equipment has to meet what are called 'interface standards' under the Radio & Telecommunications Terminal Equipment Directive of the EU (the R&TTE). For commercially available ham gear, these are basic EMC ( rubbish injected into the mains), noise radiation and conducted spurious emissions - the levels of which are in places, less stringent than the licencing requirements - but the authorities carefully ignore that as having too much potential for trouble! Homebrew, modified commercial gear and kits intended for radio amateurs are specifically excluded - and that exclusion for ham radio is enshrined in EU law. A little known or recognised achievement by the IARU.

73 
Peter G3RZP