I’d suggest moving the horn driver to 802d or 802b (b versions is their best medium format but hard to find). Woofer could similarly be upgraded to Jensen p-15ll. All will use the same crossover.

We built a pair of A7s back in the 1960s. Altec gave us the property dimensions of cabinet to mount the horn inside the bass port.
Driven by a Dynaco Pat 4 preamp to a Dynaco Stereo 120 amp, we had really good sounds.
Amazing system….

i can only imagine all the details of actually owning them and using them…… i went to Winterland many times….. it was always loud and good sound…… but i didn’t know anything about audio…… today i own a JBL 2×18 subwoofer and two 2-way 15’s on top…… srx 828p….. and srx 815p……… they have run strong and super loud w/ excellant bass and all around goodness….. all software and amps are built in….. drivers are protected and u can not blow one…… i got mine in 2016….. and never fretted about my system since…… it was approx 4500… w/ 5 years warrenty…… IMHO, vintage PA’s are for mis-guided audio people…..old altec stuff looks cool, i’ll give u that…… they do not sound better then modern boxes….. there is no warm magic like a tube guitar amp might have……. i love 1960’s and 1970’s guitar amps….. thats differant…. and much easier to collect….. my 2cents

Send me a text sometime and I’ll tell u all the ugly details about Allnic

I heard a rumor, but I’m not sure I believe you. It isn’t junk, you were raving about it somewhere. What would you replace it with? You need some old speakers and an ear trumpet.