The only Ampex mic pres I can recall where in their MX-10 series. Not especially a great unit. There are a lot of old tape recorder electronics that had a courtesy mic input and are being hyped as "vintage tube" preamps. Save your money. :td: A couple of hundred dollars will only be the beginning of your expenses and the results aren't gonna be good.
Altec did make a very good broadcast multi-channel mixer. 1567A or something like that. Somebody else on here may remember if thats the right model.
FWIW, there are a number of current mic preamps that are much better than the items you are asking about. Symetrix and Grace are just two.