1. Fender Rumble 100 Combo- purchased new in 2015 with my first bass. Nice little amp at about 20 lbs.
2. Ampeg B210 Combo - Got a good price on a scratch and dent item (where's the scratch/dent?) Want to say it was December 2015. Paired with my second hand SRW 115 cab, it's giggable.
3. Fender Rumble 100 Combo (older version with the 115) - got it for a song when I bought my first fretless. Twice as heavy as it's newer cousin, but pretty decent little amp.
4. Just picked up a GK 500MB Head to use with my new drummer's cabs. Coming in at under 4lbs, nice for tossing in the my pieces-parts bag. (I know you only asked for 3, but since my one and three are the same thing, I thought I'd complete my lineup.)