> Could the potentiometer be too bad ? As it jumps suddenly from
> 13.3 to 14.6+.

Sorry, I missed that last line when replying. R2 (the 5k pot) is meant
to provide a variable output. IOW you wouldn't expect a jump from
13.3 to 14.6. But as I mentioned in the other reply, 120R is stated
for the LM338 in the example. Maybe that has some bearing on what
you're seeing, but it could just as likely be a dirty pot. Try turning it
around (ie keep the wiper connection and use the other end terminal)
to see if that makes a difference. Unless you're dead unlucky and the
jump, if there is one, happens to be in exactly the same place ;-)

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