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Why is the Ampeg B15 so coveted?

When I first started doing club dates in 1991 I borrowed a 60's B-15 from a friend. Pretty soon it could not provide the volume needed for the larger rooms, but the tone was great. I was shocked how easy it was to set up, but the ungrounded cord made for some tricky mic checks....if ya know what I mean.
 
TLDR: can’t get a bad sound out of them.

I never knew or cared about the history of it. Got lucky with one having been one of thirty or so different amps left at different drummers’ spaces by one bassist. It was his least favorite which he left with his least favorite drummer.

I was playing a defretted hollowbody guitar through it for two months and could not get a bad sound out of that amp. Bought it from him as soon as I could.
 
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IMO:
A good chunk of it has to do with myth and legend (especially that Jamerson recorded all those Motown records with a B15).
The other reasons might be because of what might seem to be the many limitations of the amp that you list:

Very little headroom - It's just about right for a recording studio. You can actually turn it up and get that nice warm harmonically rich tone without pushing the volume too high. You can even push it just to the edge of distortion and the volume is manageable for a recording studio.

The speaker is narrow in its passband - It slots into a mix right where it should. It doesn't take up a bunch of sonic space that crowds out the other voices. Same reason a Pbass is so popular in the studio - it just works. Think of how many guys now have to have a HPF and LPF as part of their rigs. It used to be that the speaker could take care of those things for you.

Other than that, the amp - or I guess the preamp - by itself is just a very simple tone machine that works great for a bass guitar. It's a super simple tone stack that is flexible and just kind of sounds good. And good tone is not just limited to any particular genre.

As far as a modern gigging amp, they are not practical - mostly having to do with headroom / volume.
But, VERY cool in the right situation - IME.
If you are in a real recording studio (meaning proper isolation rooms), then it is perfect. On the right gig, in the right venue, it can be perfect.

In the studio:
View attachment 5297647

On the gig:
View attachment 5297648
I used to see STUFF with Gordon Edwards on bass using a B 15 on stage in the smaller clubs. Amazing stuff
 
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Having owned a late 60's flip top B15 that I still wish I had, it really did record well. It also worked very well in theatre pits.

It had a range of tones where it was really hard not to find a great one to record. It was heavy for it's size and not great small or practice amp, so it wasn't a keeper for those reasons compared to what's out there today.
 
I must be getting old. I remember before the legends.
The B-15 is a great amp BUT,
Its early history is inflated IMO, more of an East coast amp. By the time the recording industry "moved" to LA around '60, LA was a Fender town, and was so for for its heyday. Later the B-15 crept in everywhere, and I mean everywhere.
Also, pretty sure Jamerson went direct at Motown. The B-15 was his monitor.
Also, Dunn recorded with a B-15 at Stax but didn't like it.
Both used Kustom amps with 2x15's live.
At some point the B-15 became the most recorded bass amp, but I believe it was later than most people think.
 
I mean, I have never tried a real one, only emulations (apparently good ones). It's an amp with very little headroom (the 1964 version more than the 1966) and with an internal speaker that is kinda narrow in its passband. I do get the point of it for certain rock sounds but I see it sought after by all sorts of people, many of whom would be better served by a more linear amp. Like, Jamerson did use a B15 but only live (because that was all there was, essentially; either that or a Fender Bassman essentially) and never recorded with it.

IMO, I think in low volume settings, like recording, it sounds great. I had a 58 Reverberocket guitar amp that I had modified (caps? ) by an Ampeg authorized repairman which made it more of a bass amp much like the port-a-flex. Having played through a Port-a-Flex back in it’s day, even though my Reverberocket was an open back combo, it recorded very well.

That said, IMO today’s gear sounds better with much more detail, refinement, not to mention whole lot more tonal flexibility. I don’t view them as a unicorn or a holy grail, and I’ll be danged I if I’m going to plunk down what these people are asking for them when there is much better options
 
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I own a B-15n, so I have no reason to covet a B-15n.

Why do I own a B-15? Because I like how it sounds. Always have, probably always will. Do I own other amps? Yup.

IMG_7346.jpeg

^If I were to covet any B15, it would be Yauch’s plexi.
 
Is it not still the most recorded bass amp in history?

Of course a B15 is either not powerful enough or impractical live.
Depends on the gig & the genre.
There's a few situations I"d use mine, but I usually end up going for "convenience" .

A buddy of mine has a B18, converted to a 15" speaker - so a little more power.
He still gigs his regularly. They play 150 + shows a year. Just saw him last week.