I acquired these through a friend whose into horns and collects Altec.
They are made entirely of solid 3/4" Mahogany. Actual 3/4" material.
So the supposed story is a guy in town back in the mid-late 50's, bought a 15" Tannoy Silver and had a local furniture maker build a Jensen BLH for the Tannoy.
(from what I can guess they used the Jensen plans)
Then stereo became popular. So the guy had another cabinet made, but couldn't afford another 15" Tannoy Silver.
So he bought an Altec 15" duplex of some model, can't recall the model the friend mentioned.
The old glue was failed or failing, and it took some time to repair some seams and seal things up. The task at hand is mostly finish work...
Once the repairs were done, I was a bit impressed at the bass presence. It's rolling off rather fast at 50Hz, but what they do above that is rather nice.
I'm using a Crites CW1526/K33 woofer, with Faital Pro LTH142 horn, with the HF140 driver. A passive 2nd order network using an autoformer, with cut-off at 500Hz.
Mike Stehr