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So as this is our page, we'll scan the Books for ones we reckon are interesting or noteworthy.
So research these elsewhere to see the ratings we'd use today, but from the 1956-57 ones the ratings look like RMS so only later did the USA type misleading ratings begin. If noted in the book, output valves that are still favoured today are noted: EL84, EL34, KT66 & KT88. Original research, photos of our hifi & all unquoted text is ©2011-2018 by select45rpm.This is all published freely on the internet by us to further the scene, not to give any seller or forum 'expert' undeserved credibility.For Valves 10w was actually a high power in 1958 so 10w minimum unless an early Integrated.10w in Valve terms relates to about 35w in Transistor volume, from comparisons.