Trying out this WJ tuner, it's supposed to tune 0.9 to 10 MHz and
convert it to their standard IF of 21.4 MHz. Works wonderfully.
Sensitive anyway. But the frequency readings are way off-- about 8
percent low on the low end, 12 percent low on the high end. So when
the filmstrip dial says "10.0" you're actually listening to 8.8 or
so.

As Lewis Black would say, that's f***ed up.

Normally I'd go tweak what every other SW radio has- a coil slug or
big series padder for the low end, a small drifty mica compression
trimmer for the high end.

But as John Belushi used to say "But noooooo".

This multi-kilobuck box does not seem to have a high-end trimmer.
And 12% is a bit much to assign to component drift. It's a LC
circuit, so the freq goes as the square root of the LC values. It's a
bit too much to assume the coil has drifted by 23%. Major
puzzlement.

No manual of course.

Any hints appreciated.