What's up with all the different versions of the HA3500?

[TravTrav]

There's the Transient Attack, MOSFET, HA3500c....are they all the same? Is one more desirable than the others?

[TravTrav]

And then there is this one....

[TravTrav]

Bump.

[Matt Lake]

Hmmm...Not sure. My "Transient Attack" is black faced instead of silver. Otherwise looks the same. It might be all marketing. They are good old amps and cheap. Good to keep as a backup or primary amp.

[JimmyM]

Been around a long time, and like any product, it gets an occasional facelift or extra added feature.

[murphy]

The first version...transient attack/ mosfet....was made in Korea and had DBX style compressor

[tbirdsp]

Early 90's (taken out of my 1155 combo and put in a Gator 2-space rack bag)

[murphy]

How do you like the Focus 15?