Pooh Bear wrote:
Bret Ludwig wrote:

snip
Audio Precision test oscillators offer THD residuals in the 0.0006% region (
-104dB )

Not a toob in sight !

AP offers their oscillator only with their test set whgich starts at
about $7000-8000 new. A good used 200CD or its relatives is $25-50 in
working shape. Also, although the AP's gen is cleaner, it won't put the
level into the loads the HP will. And the HP will survive hobbyist and
student oopses for decades. With the AP you can kill it by walking over
a dry enough carpet and grabbing a test lead! I was a witness to that
one (it was the analyzer rather than the gen side that died-AP fixed it
gratis, but it was JUST back from cal.)