I own 4 x Ampeg B-15 amps.
And one of the Matchless Thunderman copies.
Out of all of them, the three pictured here are my favorites.
The two newer Ampeg B-15N's from the early 70's (not pictured) also sound great,
but for some reason don't really have the "Vibe" of the two earlier models pictured.
Funny enough, the Matchless sounds great if judged on it's own merit, BUT DOES NOT SOUND ANYTHING LIKE A REAL B-15...
Go figure?
If you can afford it, go for the 60's version.
And I have to say the B-12, is also a wonderful bass amp if you come across one of those buy it~!