In my experience Altec gear is really bad news in the hum and buzz department. I often end up jumping through various hoops to get the noise down. I think they were inconstant in their grounding schemes. In some cases I've had good success with rewiring to achieve a star ground. Good luck with the beast.
Bill's answer makes a lot of sense, given the lack of rhyme or reason as to who gets a usable one and who suffers with incurable hum/buzz. Line voltage levels vary from location to location and even building to building. And they are uniformly higher than they were when these things were designed/sold. I've been watching this thread angrily and that's the only answer that makes sense to me.
Interesting, I didn't know either. Funny that the file name for the map I attached shows the traditional "L" and "R" confusion in translations. Anytime I've visited, I my nickname "Bill" is usually pronounced as if it were spelled "Beer" - always makes me smile!
dropping in to give moral support and see how it's going. I saw your last post 2 weeks ago but obvs. didn't have the fortitude or fibre to reply. Just wish you'd have found something that'd shut the damn things up.
Other than that, I've got nothing for ya