Back in '75 I had a GBX rig with a 4-12 (GBX) celestion cab. It was a guitar rig, but it handled outdoor hard rock gigs just fine. It was so long ago I can't objectively compare it to later rigs. I haven't seen any bassists mentioning using a 4-12; is there anyone out there using one and whaddya think/feel about it? Just curious.
In 1974 I turned down a job with GBX here in Toronto. I considered their products to be garbage. Poorly made boxes and dirt cheap low power drivers. I thought the idea of a pre-amp feeding any number of powered cabinets innovative but the implementation was poor. I never heard about them using Celestion drivers in any of their products.
I currently play through a 70’s Ampeg V4 4x12 cab with drivers replaced with Eminence Basslite 2012s (4 Ohm each). It’s my favorite sounding cab. I modified it to come as close to the 70’s SVT/V4 rig I played all through high school (the school owned it) that, I think, had the Altec speaker upgrade option. Mine paired with my V4B reissue is great, IMO. All of that said, the 4x cabs seem to have lost their appeal, at least with the TB crowd; they are heavy and tend to have issues with off-axis frequency cancellation. 2 vertically stacked 2x10 or 2x12 seem to be the preferred cab setup around here lately. Personally though, I do like my 2x Ampeg SVT210AV setup, but just not as much as my V4. YMMV.
I'm surprised you haven't! Sorry for the picture quality of the detail, but it's all I have to work with. MY amp DEFINITELY was marked with "Celestion" in the lower right corner (where the bass version is labeled "Bass"). I won't dispute your assessment of the amp as I was moving up from a 15 watt Univox bass amp/spkr rig and a Teisco Checkmate guitar rig. That's why I've asked. Lots of room for improvement! I loved it!
I made the mistake of LOANING it to one of my former bandmates who removed the power amp (leaving a big hole in the back & wrecking the cab's sound) & claimed the preamp head "was stolen out of his station wagon"! No good deed goes unpunished!