Doc, so you got a new APO enlarging lens? Is it better than the regular Componon S/Rodagons?
And Tschmid, dichroic filters do go bad. I too bought a used Dichroic head and the filters are spotty and not consistent. I bought an Analyser Pro at the same time and couldn't get it to work properly. Switched to under the lens filtration, and it worked great! I think after awhile, they loose the consistent filtration/colors. B&H sells replacements for like $36 and are held in place with superglue (got direct info from SimmonsOmega)