I don't have much info about the 1400 series
amplifiers, but I do own one and do know they have a 50 watt 2xEL34 power section with large transformers like the
1200's. VERY loud for 50 watts! The 1400 also has a higher gain Marshall-like sound, with a little Hiwatt punch thrown
in. The pull pot kicks in a cleaner sound when pulled out. This mode can be pushed for more of a bluesy overdrive if you want.
When the pot is pushed in, the sound is Marshall-like, moderate to high gain is available, good for going from
classic rock to metal with a turn of the knob. The push-pull modes can also be activated by footswitch via the footswitch
jack on the back panel of the amp. The 1400 does not have reverb, but it does have an FX loop. They also were a little less
expensive than the 1200's when new.
The 1412 2x10" combo is relatively small (17"x22"), not really any
bigger than a wide chassis Mesa Boogie 1x12 combo. It has a surprisingly big sound.
1400 Head - MSRP $845 (1990)
1412 Combo 2x10" (aka "Little Monster") - $N/A
I see these stupidly cheap, which is good for the bargain hunter. I have
no idea why they are so cheap, they are pretty decent amps. Much better build quality than a new Marshall!