I had heard a number of rumours that at one point Yamaha had a license agreement with Altec. Never saw any evidence.
Then there is this...
Yamaha JA-2151, 1 inch mid-hi driver + exp horn pair | eBay

I had heard a number of rumours that at one point Yamaha had a license agreement with Altec. Never saw any evidence.
Then there is this...
Yamaha JA-2151, 1 inch mid-hi driver + exp horn pair | eBay
Your neighbors called. They like your music.
Interesting find. Made in Japan. The casting is a little different, along with the horn mounting holes. The driver looks like a 9 hundred series missing a cover. Never saw this before...or heard of it for that matter.
I've heard that Altec actually built some drivers for Yamaha, but until you mentioned it, I don't think I'd heard of a license agreement.
Audio_by_Goodwill
Michigan, USA

Yes it looks more like the CV with bolt on instead...but I saw a Japanese web page talking about using Altec diaphragms in a Yammy driver...of course I can't find it again.
Close copies may be the answer...OTOH, at Jammin' Jersey is a set of cast radials theory claim as 329 copies which aren't...but have Altec 3 bolt pattern.
I would really like to know about that rumour one way or the other.
Your neighbors called. They like your music.
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