I have a B25 head that is perfect working order, except it is missing two knobs (black with silver face).  Anyone know where I can get replacements?

Greg,
Try fliptops.net. Go to product information and select Ampeg from the Manufacturers pull down. You should see lots of knobs.
 
Keith

Hi Greg,
 
Depending on the shaft configuration (split, D, or solid, I might have some too if you don't have any luck with fliptops.  I know Bruce at fliptops though and he usually has all this stuff.  Shoot me an email though because I do have the manual and other stuff in pdf that may be of interest to you.  I'd be happy to send them to you.
 
Dino

I just got some replacement knobs at Fliptos.net. Good service etc.  Would recommend.  Best of luck if you haven't made your move already.