I built 4 Pultec MB-1 preamps and am selling 2 of them. They require a power
supply but you can get a kit here. http://www.stf-electronics.com/Page0015.Html
The boards are assembled and there are seperate boards for the input and output
transformers(included).They come in a rackmount case with an Ampex faceplate
with two meters. $500 for both or best offer. Some assembly of input/output
jacks, gain control etc. required.