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TheVictim said:I remember back in the day when there were Russian knockoffs of the Apple ][ around Europe, the power supplies had vacuum tube diodes.
Nigel Goodwin said:I don't think there are any decent quality ones being made these days, decades back when the UK stopped making valves the equipment was sold to Russia, who used it to make lower quality valves. I think it's probably now been sold on to China?, who make even lower quality ones!. It's got to the stage now that the Russian ones are highly sort after!.