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RE: It's not a mistake.

The schematic shows about +400V at that point. If that's correct, there's no reason the caps would need a 600V rating. You and I might build it that way, but I've seen factories do worse without adversely affecting product reliability. I'm betting they've had trouble with the 5AR4s. There have been some really poor quality copies (imports) of the original design over the last ten years. Fender probably found out the hard way that reducing the input capacitance was necessary to keep the more marginal examples alive. That's just a guess, of course, but I can't see any other reason for doing this.



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