[TenTec] Simple basic setting I can't set

[K9RT@aol.com]

Just received a nice used Orion and am amazed so far.
Have one issue that I can't figure out.
I don't have a QSK amp, just an old AL82. I try to set the delay on the TX 
menu and don't see any difference. 
There is a small difference in the delay setrting on the vox menu, but 
nothing noted for keying an amp.
What am I doing wrong? Ran it all the way from 20 to 100 with no difference 
noted.
Thanks.
Dick K9RT