you might want to talk to tom tutay at transition audio design in ft. walton beach florida. he restores some of the old altec amps (don't remember just which ones), but he could at least give you an opinion on that specific model. sorry don't have his number handy. you also might want to inquire on the vintage and tube asylums if you haven't already. IMHO old tube amps can be way more trouble than they're worth. my 0.02