Hi, Guys,
I have to emphatically echo grimniggzy and siamesetwins. I've had an original Dan Armstrong Ampeg Bass (first edition without the tone switch) since 1969, and wouldn't trade it for any other bass in the world.
This thing is heavy enough to cripple you permanently, but it punches, it bends, it's sweet and it's nasty, and you can get any sound you want with no more than the volume and tone controls and the way you strike the strings. The timber is in your hands, and the instrument just brings it all out.
Two bits of advice are to 1) always use a 90-degree plug to the input jack or you'll crack the pickguard (guess how I learned that one - twice!) and 2) never use a solid state amplifier with an Armstrong bass, or it could be the worst-sounding bass you've ever owned instead of the best.
Warmest regards...