I don't know if you ever work when you're tired, but if you do you can make odd
mistakes. I shouldn't do it but I did this weekend - put a 220k cathode
resistor in place of a 220 ohm. Wondered why it measured funny for a while!
(eventually sorted - got some 7951s going in place of 6L6s, bags more detail)
Sometimes you have to just go over the dumb ordinary bits until you notice
something you overlooked.

=== Andy Evans ===
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